|Season||Hikari Pretty Cure!|
|Home Place||Light Town.|
|Relatives||Tsukikawa Rikka (mother)
Tsukikawa Daichi (father) Tsukikawa Hinata (older sister) Tsukikawa Lily (older sister) Tsukikawa Maria (older sister) Tsukikawa Kaoru(older brother) Tsukikawa Kasumi (younger sister)
Itsuki is youngest boy from siblings.
Itsuki sometimes play with Kaoru, but Kaoru is usually with Lily and Maria. He sometimes play with Hinata, but Hinata often have a lot of other work. He is often jealous on his younger sister Kasumi, because parents didn't take so many atention to him when she was born, but actually he love her very much.