Well, Otto there is from Time Squad, so maybe his fellow agents (Larry-3000 and Tuddrussell)? The robot talks quite a bit (and he's yet another example of Mark Hammill's incredible range of VOs).
Of course, Timmy Turner from Fairly Oddparents never shuts up, either.
edit: Follow the link to the 'art' section, he has a big illo with a bunch of new characters, and under 3 he has 'new hero choice', which he explains these 3 are auditioning for a major role in the story *heh*. The 3 (well, 4) are Mac and Bloo from Foster's Home for Imaginary Friends, Otto from Time Squad, and Megas XLR. Other newly-rendered characters without the designation are Danny Phantom, Atomic Betty, Monkey (from Dexter's Lab), and Dora the Explorer. He had an illo of the Codename: Kids Next Door kids up seperately, too. Rock.
Also has up some cool fanart for Xiaolin Showdown and Teen Titans.
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