It's a drawing of the Phineas and Ferb characters at the (relatively) same age..Anyway, the reason why I drew this in the first place was because I noticed that a lot of deviants did this Durarara!! meme for various shows/movies/other media. So why not one for Dan Povenmire and Jeff "Swampy" Marsh's "Phineas and Ferb"?From top to bottom, left to right:Ferb, Phineas, Isabella, Buford, (Human) Perry, Doofenshmirtz, Vanessa, Candace, Baljeet, Django, Lawrence, Linda, Stacy, Jeremy, Agent Double 0-0 and the GIANT floating baby head.Reference: [link]