I'm gone for less than a day, and you guys go nuclear on a virgin who doesn't know how to post reviews? Without me?
Regarding Chika (Which I know stemmed from a joke, don't worry) she does kind of come off as a stereotypical (newer gen) California-Chicana girl in a way. The ones that are trying too hard, mostly. I actually figured the name Chika was a reference to Chicana or just the word chica during her intro, and that she was just a massive caricature. I can see someone not paying attention to the characters having no idea.
Of course, like baganaga said, people in real life are varied, unique, and there's similarities and influences, etc. etc. I'm mixed, and my skin goes from ghostly pale to getting pulled over in a week. Chika's just kind of a specific type of Filipina, sort of similar to a specific type of latina, and it's not too relevant to the story outside of her being hot. Love my Filipinas, though. Filipina moms are angels.