There are plenty in the sense that there are many games with morality scales that reward your participation, I think they are sometimes called red/blue morality in a derogatory sense? Superjerk vs jesus, force lightning vs whatever bargain bin replacement the light side gets.

In a lot of other games the reward for roleplaying is getting to roleplay. But thinking about it from another perspective, games where the mechanics reinforce and contextualize that, you might like Caves of Qud for the reputation system, Tyranny because the whole thing is just framing for the kind of role you'd play in this particularly fantastical setting, and Fallout New Vegas because its fun going into it with a character or concept in mind and just going nuts with it.

None of them come close to DE in what I understand you to be looking for, we could only be so lucky.