HAREM (GIRLS that got SMASH by CAESARS)

Dragon Ball: Unbeatable Pairing System

One Piece: Infinite Traveler System

No One Remembers the Dark (Naruto SI)

Tensura: The Great Tomb of Nazarick in Rimuru’s World

Pokémon: Dark-type Elite Four Starting as Team Rocket Member

Marvel: I Awakened a Technology System and Built an Android Army

Infinite Travelling from Overgeared.

One Piece: Pirate Killers