I take back what I said a few comics ago. If anyone ever asks if TIA is inspired by 8-Bit Theater, I'm going to show them this comic.
Also, Blue has no sister. I'm sure you already figured that out, but there it is.
A lot of these personality traits disappeared in later revisions of the characters. Celeste didn't turn out quite so gullible as she is here, and Blue ended up being nowhere near as much of a jerk.