We are playing the event dial Warrior Madness. I was wondering if the insane figure can still be used by the person who brought it on their turn.

THE MADNESS OF A GOD: The character on your force with the highest point value is "Insane": opposing to your force and friendly to the force of the opponent on your left. (If two or more characters are tied, that opponent can choose.) On your turn, before you give any actions, the opponent to your left can give an action to your Insane character. This action does not count against any player's action total, and the Insane character can also be given actions normally on that opponent's turn.

No as it is not friendly to your force any longer.