It might also bear remembering that in Fight!, Buxom is a
relative quality from a setting design perspective. While Ryuko, Helene, and Asuka are certainly buxom for Blitz Fighter Zero's purposes, in a theoretical setting like, say, Saikyo Oppai Densetsu, it would take a lady fighter who was truly above and beyond to to qualify.
But let's put Fight! aside for now and go into the realm of the truly strange.
Everyone knows that it is easier to lead a crowd into making foolish mistakes than it is a single person. For example, it is far simple to convince a crowd to go faster than the speed of light and violate the principle of causal order and damage the fabric of reality, whereas it is nearly impossible to convince an individual to do so.Now, I've been in tabletop gaming for some time, and I've read all kinds of games. While there are some that utilize a number of different dice mechanics, ways of measuring character capabilities, and so on, there are some that are not just way out in left field, but in fact in a stadium for an entirely different sport in the next town.
My favorite of these would be Dr. Jenna Moran's Nobilis: Field guide to the Powers.
The game doesn't actually use dice or other randomizers, for instance, under the assumption that the power levels involved mean that you can either do something or not, and chance doesn't really enter into it at all.
The power level? Well, rather than the usual assumptions, you're kinda playing gods. Well, that isn't really right. More like you're playing the somewhat divine physical embodiments of certain existing concepts in the universe, after the character has somehow ended up with one of the shards of basic reality embedded in them. As such these characters control, protect, cultivate, and in some limited ways, even define what their particular domain of power means in more abstract senses. Over the course of the game characters will fiddle with the mortal world to empower their particular Estates, struggle with other Powers, and even fight off powerful enemies born of the void who don't really like the idea of things existing.
It's really quite a trip.
Filthy perverts and their perpetual motion machines.*
The game gives a rather enormous amount of latitude to what players can create, as practically any concept is fair game- it's not only power over concrete things, but also abstract qualities of what that thing represents.
So, what's a guy like me to do with a system like this?
Why, create the Power of Bustiness/Bakunyuu itself, of course!
Now, character creation is rather a group effort normally, and really, determining the character's capabilities is only about half of it- it also includes things like the character's philosophy, what kind of supernatural being planted the reality shard in the character, what his/her/whatsit's domain is like, and so on. we will be doing the capability part, since it's the most straightforward, if anything in this game can be called straightforward.
First off are the character's passions and skills, which both draw from the same pool of 8 points, and affect a character's mortal actions by boosting the power of their intentions, which are really just declared actions. So, let's say that our power of bustiness is something of an optimistic soul that's all about leveraging her perpetually enormous assets for the greater good of the universe and other places besides. So, her pool might well be allocated as follows- keep in mind that all passions and skills are player-defined within reason. Reason will be leaving beyond this step, so no worries.
Passion: I want the beauty of bustiness to be recognized, especially mine (3)
Passion: I want to learn what truly attracts others (1)
Passion: I believe that the world can always be made better (1)
Skill: Fashion (1)
Skill: Seduction (2)
Now come Afflictions and Bonds, which are basically more essential traits of the character that affect their ground state, and how hard that is to remove. 13 points are allocated to these. Afflictions are more about things you are, and Bonds are more about things you do, and without some supernatural interference, these traits are assumed to always be in effect. Now, this is where players get more free reign in defining the more supernatural properties of their character. So, how stacked is our heroine? We're in a game space where both "depends" and is always the biggest in the room" are acceptable answers, so lets go with that, as well as some more proper traits associated with bustiness and her supernatural properties thereof, concerning how she puts her best boob forward.
Bonds and Afflictions
Affliction: I must be the bustiest person in the room (4)
Bond: I always show others their own beauty (3)
Affliction: I am never out of milk (2)
Bond: I am taken seriously in spite of myself (1)
Bond: Nothing I say reflects badly on those who share my figure (1)
Bond: I always present the best side of myself (1)
Affliction: my clothes never burst, no matter how much strain they're under (1)
Next come Properties, which are seven points spent to determine both the abstract and concrete properties of the Power's "Estate", or domain of influence. that has already been defined as Bustiness, as established above, and these properties, in a general sense, define what the character can affect with certain kinds of Miracles. So, aside from being sexy, what do gigantic breasts typically represent, inspire, etc.? In my own little reckoning, it probably looks something like this-
Bustiness...
...Inspires great passions and great jealousies (3)
...is a life-giving aspect of motherhood (2)
...delivers comfort and joy to young and old (1)
...draws attention from bearer and observers alike (1)
Next are Qualities. These represent how strong a Power is in various aspects of his/her/whatsit's of their miraculous abilities. These draw from a separate pool of points, and the rating the character assigns to each of these affects how much effort it is to perform miracles of varying power. Note that it only affects how much miraculous effort a character has to exert to perform a miracle. Even though our Power of Bustiness has a fairly low aspect rating, which covers physical miracles, she could still, with some amount of effort, pick up your house and throw it into a lake. With less effort she could win gold at the Olympics in whatever event suited her whims. Nobilis isn't so much a game of
can you do something, but
should you. Low numbers aren't especially limited, and zero isn't a curse.
Aspect governs physical miracles, like the aforementioned house-throwing and medal-winning. She will have an Aspect of 1, which means she's always strong as a professional athlete, physically skilled as a veteran warrior, and intellectually agile and creative as a scientist or artist. It takes effort to move up from there, but it works just fine. Next is Domain, which affects the Power's ability to affect the
things of their estate. Whether the object itself or its other properties. Our Power of bustiness gets a Domain of 4, as we want her to be very capable of manipulating boobies, and all associated properties with wonderful ease. Persona has to do with assuming and transferring the properties of one's estate, and that's secondary, so that gets a tool. Last is treasure, which is miracles of one's possessions, which is zero. That isn't to say she's entirely worthless in that regard, as one with treasure 0 will still, say, have an awesome car that doesn't need gas, a computer that doesn't need electricity, and so on.
Qualities:
Aspect 1
Domain 4
Persona 2
Treasure 0
Now, as we still have points left over, we can now turn to Gifts, which are basically supernatural powers that may or may not be related to the Power's Estate. Now, a woman needs to protect herself, especially against all of the supernatural thingamajigs about. Now we could make her physically invulnerable to most things, but that's really not her MO to be all overt about such things. So, we'll take Immutable, which protects her from more esoteric shenanigans. We will also take Unblemished Guise, which allows her to easily pass as a mortal being, rather than the supernaturally charged stewardess of bosoms that she is. Lastly is Glorious, which allows her to basically flick a switch and cause extreme emotions and sensations in anything around her. For example, she could appear so beautiful that most creatures wouldn't dare harm her, and so on.
Gifts:
Glorious
Immutable
Unblemished Guise
Now, while Aspect and Treasure have the same Miracles across the board, Here are sample miracles for Domain and Persona, which generally have more loosely-defined capabilities.
Miracle points per quality: 5
Sample Domain miracles
0: Know when something endangers bustiness
1: Increase someone's cup size overnight
make someone suddenly jealous for about an hour or so
distract someone from whatever it is they were doing
2: find out the details and origins of another's bustiness
3: Inflame someone's jealousy
Make a huge bust larger
4: make another's bust enormous on the fly
Cause someone to be immediately and entirely distracted form a task, regardless of importance
Cause another to become enormously jealous of one's self or others.
5: Snuff out another's jealousy
Eliminate all of another person's distractions
6: Change the destiny of a particular bosom
change the target of jealousy or passion
7: Create titanic bosoms, jealousies, or passions
8: Create great acceptance, reconciliation, and indifference
9: Create fully-realized bosomy women from thin air
Manipulate the laws to create emergent protections for bustiness.
Sample Persona Miracles:
0: Recognize people/things with a strong connection to bustiness
1: Make someone induce more passion or jealousy
Make someone more comfortable to be around
2: Spend a scene as another woman's bust
3: Declare that others are jealous of you
Declare yourself a big distraction
4: in a city block, declare bustiness to be the ultimate object of desire
Make it so that everyone is intensely jealous of something they mayor of a city has
Make everyone on the block really, intensely passionate about digital watches.
5: Make people utterly indifferent to the golden chariot pulled by four flaming horses rushing down the street
Incarnate in various bosoms across the cosmos
Incarnate in the passion between a pair of local gods
6: Make the local DMV clerk a target of vague but intense jealousies that only end up doing him good
Declare yourself do distracting that the world news cycle is thrown off-kilter by your presence
7: Make a penny on the opposite street corner the literally the most fascinating thing in the world.
Make a huge pair of breasts be able to resurrect the dead with its givings.
8: Make the currently occurring nuclear exchange seem about as mundane as the grass growing
9: Make new York a place where bustiness is sacred, celebrated, and cultivated.
Sania Sar-Cavari did used to be human, sure (and had a more sensible name back then), but things tend to change when one gets a basic concept lodged in them- in her case it became lodged in her chest, a portent of what was to be her domain. It wasn't as though bustiness was an especially new concept, of course, but its power and influence in the world at large tended to wax and wane as standards of beauty and philosophy. As with all Powers, she wasn't exactly a big fan of the "wane" part of the equation. It was helpful that her Imperator wasn't a creature that was easily stirred by most anything, imaginable or not, so she remains generally free to pursue her own goals in the world. She tends to masquerade mostly as a model, to push things more subtly with her attitude and poise, but is easily stirred to more dramatic action as her estate requires.
She lives in the 13th floor of her building, remaining on and off the grid at the same time, as real 13th floors are incredibly hard to find for those who don't know how to look. This state of affairs was caused by the fact that the Power who shapes and controls the destiny and influence of the number 13 has gone underground for some time for reasons that are deeply embarrassing and he doesn't care to discuss.*
And, there we go.

*He wasn't in especially high favor, anyway- the apex of his influence was when "the 13" was one of the most heavily fantasized and glorified sexual position, but essential on-the-fly retroactive corrections to human anatomy had to be made that make this position now impossible, leaving humans with only the far inferior "69" as a consolation substitute.