UPDATED: 07-14-2008
Ok, so I got bored tonight so I decided to go back and give a little backstory to all the characters in this pic. Now, as I've not ever really explained, these guys are for a cartoon idea called [Sketchpad]. I know I had the stupid comic a long time ago and I said I was going to keep doing that but it kinda died out. I revived the idea in my mind and went in a totally different direction. I'll make a story outline some other day. Anyway, onto the introductions, shall we?
Bottom Row
Manatee
It's exactly what you think it is.
Chunkers
No one is exactly sure what the hell Chunkers is. He's just this little red thing who sits in the background and makes a weird "meehr" noise. He can also eat thing several times his own size whole. Kind of like Nibbler from Futurama.
Katherine
Kartherine is...well, crazy. Most of her speech in incoherent and has no relevancy to what is going on. She has the habit of performing various random acts, so random that even I don't know what they are. Despite being legally insane, she is a genius when it comes to mechanical devices. Giant robots intrigue her and she even built her own Katherine-Bot once, just because. Katherine has a plethora of enemies, Dr. Braindroid being the most predominant one.
Heroboy & Pikapoo
Heroboy is a young Pokeeman trainer who dreams of one day becoming a Pokeeman Masta-Yo. His trusty Pokeeman, Pikapoo has the ability to create Atomic Fart blasts that can prove to be quite destructive (and smelly...it has an odor).
Matty Wilkins and Guartok
Matty is an American teenager, who was sent (via catapult) to live with his grandfather in Japan after his parents were caught selling drugs to small children at recess. Matty is very timid and the world's biggest worry-wart. He's afraid of his own shadow and probably isn't too smooth with the ladies. However, Guartok makes up for Matty's lack of manliness. Guartok is a frickin' crazy demon from God knows where. He's mean, angry and just out-right destructive. He can shoot a green energy beam from his mouth when he wants to.
Tasuri
A nature girl who's age is guessed around 19-20. Tasuri is a nature-loving, environmentally conscious chick. She can sort of communicate with nature (she's still working on that). She has a big 7 foot sword she carries around, just in case she needs to kick some major ass. Tasuri is sweet and kind and very calm in nature but she'll get angry and in your face if she needs to. She is partners with Mog.
Mr. Lightning
Part of the superhero team, the Unfamous 5. Mr. Lightning (obviously) has electric-based superpowers, which he got from some jewel he found in Cambodia. He's usually wise-cracking and a general jokester. Lightning hates to be serious and would gather just slack off and do something fun. It usually takes a life-threatening situation to get him fully motivated for a fight.
JD/Domino
JD is an ordinary teenager. He has a passion for drawing and it takes up a good amount of time. After accidentally tearing a hole in the universe, JD discovers that all of the characters he's doodled over the years have manifested themselves into an alternate universe. As to not give away that he is the creator of all the toons in that universe, he masqueraded under the name Domino. He first met up with Mog and Tasuri, who helped him defeat a villain named Redvolt and helped him get back to his own universe. Before returning to their universe, Mog gave JD a magic item called the Sketchpad. With it, JD could summon characters he's met in the toon universe into his own universe and use them for assistance. He now must use the aid of his toon friends to stop all the toon villains and monsters who have found a way to travel into the real universe.

To be continued...