Schnozmo Cosma is Cosmo's older brother who bears a similar resemblance to him, except that his nose is much larger, hence his name.
Schnozmo is a con man who tricked his simple-minded brother Cosmo into giving him his wand, a jar of pickles, and a TV to find an evil scientist who does not really exist. But as gullible as Cosmo is, Schnozmo thought he'd never find out, until Wanda followed him and Cosmo heard he was lying, breaking his heart. Feeling sad for his little brother, Schnozmo pretended to be a spy in a play made by Wanda, getting mauled along the way just to make Cosmo believe in him again.
Schnozmo looks almost identical to Cosmo, sharing the same green colored hair and eyes, the only difference being that Schnozmo has a much larger nose than Cosmo and all other characters on the show. He also wears a tuxedo like a secret agent, although its not known if this is his actual everyday attire since he is not really a secret agent.
Not much is known about Schnozmo because he has only appeared in one episode. He himself stated that he would never want to hurt his brother, and this is further proven when he takes part in a made-up plot just to spare his brother's feelings. He doesn't get along with his sister-in-law, Wanda, mostly because she doesn't trust him. His relationship with his only nephew, Poof, isn't expanded upon either, but he is surprised to see him, even asking "Who's this little charmer?" only for Cosmo to reply "That's your nephew, Poof!". He also missed Poof's birth, like Wanda's sister Blonda. He has a lot of trouble remembering Timmy's name, calling him Lorenzo, Fernando, and Horatio. It is likely he doesn't get along with Jorgen von Strangle, since he fled from the restaurant he owned, causing Jorgen to go after him. Also it is unknown what his exact relationship with Mama Cosma is like since we have never seen them together, but her not mentioning him to Timmy can be interpreted that she prefers Cosmo over him since Cosmo is more naive than Schnozmo. Schnozmo is also older than Cosmo, since Cosmo was the last fairy baby born before Poof.