My nickname is more like a pseudo(-nickname), and iI'm calladdressed here as "haizakyl"."

I'm surprised that "pseudo" can be its own noun, but feel free to take or leave what I've put in parentheses. Also, "addressed" has more of a labeling nuance than "called" in my opinion, but you could also write, ". . . and I'm called 'haizakyl' here" for simplicity's sake.

It's basically a wordplay between my name, Kylian, and a character from "Inazuma Eleven," Haizaki Ryouhei.

Separate specific examples from their general categories, and always put quotation marks around works of fiction if you can't italicize them or something.

It's simple, but i like it.

Always add commas between independent and dependent clauses in sentences.

My nickname is more like a pseudo and ihere I'm called here as "h"Haizakyl".

It's basically a wordplay between my name, Kylian, and a character from Inazuma Eleven, Haizaki Ryouhei.

It's simple but iI like it.