Kankuro is Temari’s brother. He comes to Konoha together with Temari to help deal with the poison and make an antidote. They bring poison samples with them; at the beginning of Temari’s route Sakura asks Kankuro to bring the protagonist to the hospital, then Kankuro stays to help Sakura with the antidote while Temari goes out.
Appears in Temari’s Walkthrough.