I was obviously mistaken, not knowing who wrote the comic.
The name itself still sticks out as odd to me (it's not one I've ever heard or seen before) as is the character's use of Spanish in that manner struck me as odd as well.
The writer may be Hispanic but, in my opinion, that doesn't make the panel/page any less silly. It seems to be trying to hard to inject a Hispanic character into the story. Rather than making the character look Hispanic and leaving it at that they have to go all out and make the character practically say "Look at me! Mia Espanol!"
I may have been wrong about the intentions behind the author but I still find it a bit silly and "trying too hard" to diversify the comic's "cast."
There is no Hispanic look. They can have dark skin or light skin, curly hair or straight hair, be a blonde, brunette or red head. And yes, some do mix english and spanish when they speak.