Velmont and Brogarn, if you'd both like to play, we'd be happy to have you. It seems as though you've also both divied up roles as well... Velmont with an spellcaster, Brogarn with a rogue. Sounds good. As far as who you might play, I'll first list out several of the game's NPCs that could fit in to the roles you are looking for, if any of them fit your bill.
* Skunn Bilgebottom the gnome is an artificer.
* There is a halfling male who works at the healer's compound who is an artificer.
* Rarril Thom the young shifter can be a rogue.
* Jango Silversun is an elven sorcerer (originally he had been kidnapped, but I could easily allow him to "escape" and meet the party, and he'd have a good amount of information of the humans on the beach who seem to be behind everything.)
* Any of the existing Watchmen (or even a new Watchman you create) can easily have two rogue levels. The existing Watchmen are three humans - Citen Boggs, Symon Barr, and Jerrit Rodden.
Also, if either of you wanted to play lizardmen (either rogue or sorcerer) I will go ahead and change the lizardman's stats to make it a LA +0 race. Right now, lizardfolk has two racial HD and a LA +1, meaning that the character would ordinarily start at Level 3 even without any class levels. I would go ahead and re-create the monster race to make it LA+0 and thus you could have two class levels like everyone else.
You can also feel free to create entirely new characters, but please take a second to read through parts of the IC game thread so you can see where the party is from, where they are, and what kind of character a rogue and an arcanist might fit in. Thanx guys!