That is because you are not the target audience for her, and by extension of that, you will most likely barely to not be in contact with people that are, let alone befriend them (and the other way around).

The various different portraits and styles appear to different player types within their total addressable market of players.

Not to say that one can only like one or the other, but generally speaking the average "I love edgy muscular, tattooed up Illidan" person is not going to be the same one that runs an exclusive lineups of maximum skin-showing waifus, as someone who likes the cutesy stuff, as someone who is really into the joke/fun characters, etc. ...

And what do you know? There is more overlap in people getting to know and interacting with each other that have a certain preference.

They got the numbers - usage and sales. Guaranteed their market capitalization is top, and that is just one piece of the cash puzzle.