Simple. This feels too much like showing off their "assets" while the ones that I have favorited don't focus on that but rather a more accurate representation of the life of those characters.

I think that you'd be referring to the swimsuit ones from Queen-Orange? Those are from the anime Code Geass, in which those three characters are actually wearing those swimsuits.

C.C. in casual clothing is also cannon with the anime.

I haven't seen Miss Fortune and Sivir wear those bikini's before ingame.

Of course people are free to do any creative thing to make their suit to their own image, but

this is just showing off cleavage.

Not bad cleavages mind you, but I just got annoyed by the tag that this was in the cosplay section.