|Relatives||Gegenhuber Grisela (father)|
|Anime Debut||Episode 25|
Ernst Grisela (エルンスト・グリーセラ), commonly known as Eru, is the son of Gegenhuber Grisela and Nicola. He is very sensitive in his ears, and because he his half-human and half-Mazoku, his can sense what the animals are doing and can make command them of himself.
- In English, he was nicknamed "El" since the Eru (エル) from Ernst is pronounced like "El".
- In the novels and manga, he is not born yet.