Michal Minato

Miharu Minato is a character from Kamen Rider × Kamen Rider Fourze & OOO: Movie War Mega Max. Miharu is from the future who came to the present through a time anomaly. This caused him to split into two beings, an evil version of himself that became Kamen Rider Poseidon and a good version that became Kamen Rider Aqua.

Etymology
Minato means harbour which is a reference to both of his rider identities.