Riku is the second youngest at 18 years old. He’s 5′9″. Bisexual. He’s the quietest and most shRiku is the second youngest at 18 years old. He’s 5′9″. Bisexual. He’s the quietest and most shy out of the family. Riku gets nervous when meeting and talking to people. If he went to a cafe with someone he’s the type that would be too nervous to order what he wants. He’d rather not have to talk to strangers if he doesn’t have to.