Xayah's entire thing is being edgy and rebellious.
>"Spiders are my spirit animal."
"I hate flowers. Tiny skulls stuffed with twigs, on the other hand... "
"Cloudy days are my favorite."
"I prefer to work at night, because, y'know, the sun? Bright? Yuck!"
"Death was nice and peaceful. Thanks for ruining it."
I think the 'Anti-Star Guardian' thematic fits her rather nicely. Much better than the regular Star Guardian aesthetic (Which personally, is pretty boring and overdone at this point, but that's a totally different conversation to be had).
Zoe and Rakan can be debated both ways. But Xayah definitely works for it.