|Name in Japanese||三河 海|
|Rōmaji Translation||Mikawa Kai|
|Voice Actor (Japanese)||Daisuke Ono|
|Voice Actor (English)||Eric Vale|
Kai Mikawa (三河 海 Mikawa Kai ) is the fourteen-year-old son of the head of the multi-million dollar Mikawa Corporation. He rivals Nagasumi for Sun's hand in marriage. While looking for a servant he befriends Hideyoshi Sarutobi. He is usually seen in a navy uniform.