|Relatives||Shikon (twin brother)|
|Manga||Chapter 3 (cameo)|
|Anime||Episode 5 (cameo)|
Shikoku is a character in Children of the Whales. He is Shikon's twin brother.
Shikoku has black hair that covers one of his eyes, and wears a black shirt and pants. He can be told apart from his brother by his lighter bow and his upward-pointing cowlicks.
Like his brother, he has a dislike for the Unmarked of the island, and dislikes listening to their orders.
|Mud Whale||Chakuro | Lykos | Sami | Suou | Taisha | Kuchiba | Shinono | Masoh | Ouni | Kicha | Ginshu | Shuan | Siena | Hakuji | Lasha | Kogare | Kikujin | Miru | Shikoku | Shikon | Nibi | Neri | Aima | Byakuroku | Dyo | Ekato | Miden|
|The Empire||Orca | Liontari | Arachni | Itia | Atsali|
|Kingdom of Siderasia||Rochalizo | Dictis | Adihilas | Palamesosu | Daktila|
|Other||Olivinis | Kokalo | 王子 | 宮廷道化師 | 国王 | 女道化師|