Girls can be buff, yes. Not my favorite aesthetic for female characters (which sounds way worse than I meant it to…), but it certainly is a viable aesthetic.
But none of the traits you typically see in feminine character designs are really present here, except maybe the proportions on the feet.
Yeah unfortunately thats very hard to do with bionicle parts >.>
Edit @Ekorak
Sorry I made it unclear, I meant making something look female and buff at the same time.
I find it comes rather easily. I’d give examples (possibly even from my own portfolio) but it would be getting a bit too far off topic. This just isn’t the place to debate this.
EDIT: @AwesomeJoel27
Still not impossible. I can think of a few other people have done.
But you are correct, it’s significantly harder. Won’t argue with that.