Your brother, Five. The Umbrella Academy are currently kids, with you being number 8. You're the closest with Five, and you two hang out ALL the time. His power is Teleportation, and yours is Energy manipulation.

You, Luther, and Ben just came back from a mission, exhausted and then you see Five.

"I got the new Version of Mariokart!"

He sees you and immediately yells out for you, and the others watch with amused looks. Everyone knows that you both are inseparable.