DnD Character Concept: A Cleric who insists stubbornly and earnestly that their obviously evil patron deity (I'm thinking Lolth or Asmodeus but really any Evil Greater God would do) is actually Good and Benevolent and Just and dismisses all evidence to the contrary as slander from rival deities. Their proof to their claim? Using their divinely granted powers for the most intensely Good tasks and quests they can find: feeding the hungry, protecting the weak, curing the sick- all done in the name of their Terrible Dread Lord and without any expectation of compensation or string attached.
The deity in question is all "???" but keeps granting the cleric power because all that free worship and influence from the people who now pray to them is nice, and hey if the cleric wants to put in the leg work to launder the deity's reputation what reason do they have to say no?
Only it turns out that the cleric is actually playing 4D chess because of the way faith works in Faerun (and most DnD settings). As more and more worshipers start believing The Terrible Dread Lord is actually a Good and Kind and Noble god they start to be influenced by that to become Good and Kind and Noble. Slowly but surely they find themselves warping to match the perception of the masses. It starts by just giving a few random blessings out of what they think is pity, or maybe sending a sign to help someone who is lost on what the deity insists is a whim....but it snowballs until you have Lolth smiting down slavers or Asmodeus sending out devil's to drag down a tyrant to the depths of hell and then they realize 'oh oh no' but by then it's to late: the religious reform movement within their flock is too massive and been ignored for too long as benign. They can't just turn around and smite their own followers- not only because it's tacky but because they feel... compassion and responsibility for those that look to them for guidece.
And then you have the cleric, who at level twenty is literally their most powerful agent and also the high priest of this out of control heresy smugly sipping their tea because they where right all along. Their faith in their deity is vindicated- after all what is faith if not believing in something so strongly, against all evidence, that it becomes truth unto itself?
