 If you liked
Tensei shitara Slime Datta Ken
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 ...then you might like
Shinka no Mi: Shiranai Uchi ni Kachigumi Jinsei
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1) Both main character are transported/reincarned to another world
2) The story set in a fantasy world
3) Both protagonist are related with "monster"
4) Both main character can learn abilities automatically because both have cheated abilities or can steal the skills of his enemies