Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka, Gate: Jieitai Kanochi nite, Kaku Tatakaeri Recommendations
•Main character have similar personalities and both very strong.
•Both characters go to a place filled with danger and adventure (in Gate, they go through a gate to another world while Dungeon Ni Deai, the mc goes to a dungeon with many floors filled with many monsters.
•Similar environment (a world filled with elves, mages, gods, etc.).
•Both anime have multiple women falling for the main character.
•Some fan service (more on Dungeon Ni Deai though).
•Both anime are very good.