Brain is a Keyblade wielder who appears in Kingdom Hearts Union χ. He is a member of the Dandelions and was chosen by the Master of Masters to lead a Union after the Keyblade War. Like the other new Union leaders, he was given a book with laws set by Ava. However Brain has declared he wishes to use the book to achieve a personal goal of his, wanting to be the virus that will alter the events set in stone.