Roles in a Party

[ChaosStar]

Okay I'm almost done remaking my all half-breed Adventuring Party. I have just the Blinkling left to go but not sure what to make him. He was originally a Ranger, but I'm not sure if that's right for him. The Rest of the party is as follows:
A Watcher Paladin(Tank, secondary Healer, weak Face)
A Kestrel Scout(Scout, Archer, and Skill Monkey)
A Half-Ogre Hexblade(Debuffer and secondary Tank)
A Trixie Soulknife[pathfinder version adapted to 3.5](Speedy Tank)
A Spring Child Sorcerer(Arcane Blaster, Summoner)(Eventually going to be an Eldritch Knight)
A Merg Spirit Shaman(Divine Blaster, Healer, Face)(Eventually going to be a Stormcaster)

Races are from Bastards and Bloodlines(http://www.slideshare.net/MewChan/dd-35-bastards-and-bloodline). I was considering making him a Rogue so the group has a Trapfinder and a better secondary Face than the Paladin, but I'm not sure. Are there any roles I'm forgetting? Does anyone have any advice?

[Temotei]

If the casters are lacking in buffs the last character could be a dedicated buffer.

Also, scout already has trapfinding (but not Disable Device).