I only know Black Clover by its reputation (loud obnoxious kid) - though you did inspire me to give the manga a go. Thinking of fire elemental magic, specifically draconic magic. I'd say the basis would mainly be creating and manipulating flames, but I'm thinking there'd be some self-enhancing spells down the line too, if that's fine. (Read: I have FCs which are humans with horns/slitted eye I'd like to make use of if possible lol.)