User blog comment:B214/Volume 23 discussion blog/@comment-77.188.198.116-20170425220958/@comment-79.25.167.4-20170425230915

We don't know if the mother of Rudiger's child was a supernatural being or human. Probably she was.

By the way the children of a reincarnated devil is a devil. Even reincarnated angel's kids are angel. Look at Issei and Irina's child: Shin. He has a dragon wing and an angel wing, this means he is also an angel even if his mother is a reincarnated Angel.

So Issei's kids will be half dragon/devil and half "what their mothers are".

Kurenai: devil/dragon/fallen angel

Shin: devil/dragon/angel

Airi: devil/dragon

Robertina: devil/dragon

Ex: devil/dragon

Zen: devil/dragon

Shirayuki: devil/dragon/nekomata

Kurobara: devil/dragon/nekomata

helmwige: devil/dragon/valkyrie

Ernestine: devil/dragon/vampire