Odhanan
Adventurer
I'm running a Ptolus game. When we generated the PCs, we decided to go with straight D&D as a principle (not a hard rule) and expand from there. The only exception is Heinrietta Nagel who uses the Eldritch Might Sorcerer.
From there, the players are free to choose whatever feats, PrCs etc. "crunch" they want from other sources as far as character development is concerned, provided I give my approval to it.
I think that flavor mainly comes from the players loving their characters and experiencing what they want out of the game. Restricting the options will be counter-productive in many cases, because a reluctant player doesn't make for a good immersion.
From there, the players are free to choose whatever feats, PrCs etc. "crunch" they want from other sources as far as character development is concerned, provided I give my approval to it.
I think that flavor mainly comes from the players loving their characters and experiencing what they want out of the game. Restricting the options will be counter-productive in many cases, because a reluctant player doesn't make for a good immersion.