The Support character is one that has few capabilities that match other archetypes. Instead, they focus on general capability, mundane approaches and enhancing the effectiveness of other characters in a team.
D20 Support Class
Hit Dice: 1d8 per psychic level
Hit points at first level 1d8 + constitution modifier
Hit points at higher levels: 1d8 (or 5) + constitution modifier
Incarna Core Support Archetype