I'd love to join this! 

As for a question, could I have a caster who focuses on a general concept instead of a school of magic? 

Your example character uses abjuration, but the character I'm imagining for myself doesn't just stick to evocation or any other schools too hard. 

I wanted them to deal with lightning and storms, which can breach out into others, such as abjuration to create sounds or weather-like effects. While naturally they would use lightning based attacks and such. Would you rather we focus on schools then disambiguations?