Conquering Everything in the Multiverse, Starting with the Titans

A crossover harem story. The girls are all going to be mine (probably).

Golden finger: Domination, memory alteration, skill copying. Basically, the protagonist is invincible.

Protagonist's personality: Morals are flexible, I guess. It is a power fantasy, after all.

The worlds he will probably transmigrate to: Attack on Titan, Re:Zero, Mushoku Tensei, That Time I Got Reincarnated as a Slime, So I'm a Spider, So What?, Overlord, Naruto.