Riku Hikaru

"'Oh you messed with the wrong big brother. You think I'm scared of a little energy blast? You'll see soon why that was a mistake.'"

Riku Hikaru, also known as Monolith, is a new professional hero. He is also the older brother to Yuki, Karma, and son to Okano Hikaru and Kobe Hikaru.

Riku is known for having the power combo with his sister's opposite of power absorption. Unlike Yuki, who prefers to fight in hand to hand combat, Riku prefers to fight from a distance and absorb energy damage.

He was old enough to watch as his family deteriorated in front of him. His mother and father's fighting through closed doors, his mother's constant leaving for nights at a time. He found the letter before Yuki, hiding it until recently when they together put the letter in the home shrine.

Riku is a protective person, especially of his little sister. Despite his own opinion, he hopes that one day she becomes strong enough to protect herself and others. She is the only part of his father, besides himself, left. If anything hurt her; may gods above and demons below have mercy on you because he will not. He raised his sister more than their mother, helping her with the homework often assigned and helping with paperwork to get into UA.

He has been locked in a legal battle with his mother over custody of Yuki, going so far as to have Yuki live with him most of the time. While he has partial guardianship, he is still fighting for full custody to protect his sister from their mother.