Alex Fierro
A really good character from Rick Riordan's Magnus Chase series. Appears on the second book "Magnus Chase and the Hammer of Thor" . Genderfluid. Loki's child. Heterochromic ( has two different eye color).The best. Will cut your head. If you ship her with Magnus(the ship name is fierrochase, or beatrix, because malex gets confused with malec) , you will find a lot of potterey based fics.( There is not a lot of fics...)Call her " she" unless and untill she tells you.

Spoiler: People say FierroChase is cannon. I don't know. The 3th book is not tranlated to my main language and not sold in my country. Help me. I wanna read it.
Alex Fierro is the best.