For now you could try Dungeon Defense MC is a genius cunning protagonist who is a Sadist Warlock of the Magus World MC only cares about himself
Not sure if any of my recommendations will to your interest but here goes nothing 1-Everybody Loves Large Chests | RoyalRoadL (Chests here mean literal chests as in the ones you put treasures in in a dungeon, the MC is a mimic that kills humans because they are his favorite food) 2-Threadmarks for: In my time of troubles (DnD SI sorta) | Spacebattles Forums (a Si into dungeons and Dragons as an orc the MC is more Chaotic neutral than evil) 3-Another Realm series is about an SI-ish MC (note that i didn't say Si but SI-ish)in MassEffect(1 till 3) in the first 2 volumes he might seem hero-like but after a certain incident he gets pretty cruel and paranoid( to be fair he was gradually getting there but that incident destroyed whatever self restraint he might have had) he also seems to be on his way to being a warlord of decent influence Author link: https://www.fanfiction.net/u/1383650/Katkiller-V
Leylin also prefers a little thing called 'EQUAL EXCHANGE', no matter wat benefits he is going after. So I still dont see how you call him selfish wen there are many other mcs that wouldn't even think about equal exchange