Sparrow

Sparrow is an upbeat and confident girl who's also close friends with Faith. They met in elementary school and became friends quickly when they collaborated on an epic LEGO creation. She sticks up for him because he usually can't bring himself to do so. She's just generally the mom friend, and she's very curious and nosy (in a good way). Sparrow is also very passionate about becoming a dog trainer someday, and she currently volunteers at an animal shelter.
She knows that something is going on with Faith almost immediately after Flame awakens, and she's dead set on meeting the "other Faith". Unfortunately, Flame is a gremlin and doesn't want to come out in front of her just to be annoying, although once Faith and Flame communicate more, he's more open about it.