Tensei Ida

Tensei Iida (飯田天睛), also known as Turbo Hero Ingenium (ターボヒーロー・インゲニウム), is the older brother of Tenya Iida and a Hero.

Ultimate Space & Jams Arc
Ingenium is briefly mentioned by Tenya, when talking about his family.

Sports Festival Arc
Ingenium is killed by Stain.

Trivia

 * Ingenium is the first known character to be killed.