Zhaleskra
Adventurer
If you could all agree where a game 'needs' to be each of those things.
Well for me, that's easy where things don't require much thought, streamlined being the core mechanic remaining the core mechanic most of the time (e.g., no sub-system for grappling), and complex where you need to put more thought into it than "I hit target X" or "I cast such and such spell at target Y".