Meet the devil in honkai impact as a Dad????

tokiwa shougo reincarnated in honkai impact III and
this memories merge with 3 other memories
1.(before reincarnated as a demon king just some ordinary student play game and watch anime with name kuro stellar/half japanese half europe and half chinese)
2.(after plane crash he reincarnated to become tokiwa shougo in kamen rider zio)
3.(after rewrite the world(in kr 21 decade timeline)
he getting reincarnated as a 28 year old with 3 system 1.sign system 2.leveling system 3.chat group system).

After some girl he adopt we are this father siegfred
with brain hole( i want to know how can cecilia love him)fight the honkai.
Kiana : your will become my only dad,i hate my own smelling dad
siegfred: kiana why your not cal me dad like him
kevin :some time i want to know how did this happen
honkai will:interisting human i want to know what happen when he became
kuro belike what the hell this drama.
(I will make the story when im bored that it)