 If you liked
Tensei shitara Slime Datta Ken
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 ...then you might like
Sekai Saikyou no Kouei: Meikyuukoku no Shinjin Tansakusha
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1) Both main charaters are transported to another world
2) Both main characters start off weak
3) Both main characters gain skills that make them more powerful (Sekai is more of a buffing skill that buffs his allies, making them powerful)
4) Both stories are set in a fantasy setting
5) both have rpg settings as well