Hi, I'm thinking of making a fanfic with the protagonist being an OC who is Arata's brother. He would go to magic school together with Arata and take part in the adventures along with them, but I am having some doubts and thought that you could help me. The doubts are:
1 - What should be the Archives and Thema of the OC? (His powers)
2 - What should be your grimoire? (I thought about separating Sora and Ilia between Arata and OC what do you think?)
3 - Arata and the OC will have a harem, but I wanted to know which girl should stay with whom?
4 - And finally, I have doubts about how to continue with the OC, if I make him become a Maou as his brother or if I make him become a Hero to "fight" with the Arata?
If you can help me with this I would be very grateful.