Teacher Iruka (イルカ先生Iruka Sensei?)
Voiced by: Masami Iwasaki

The teacher of the Sunshine Academy's Plum Section. He's a pink dolphin who walks around inside a fish tank, which the students finds it very weird about him during his first time teaching the students. He is hot-blooded and strict sometimes, he knows how to support his students during their studies at the academy. He has a huge crush on Jill. Iruka means Dolphin.