[@ineffable] Hi. I think your birthyear would make Charlotte be in the 7th year of Hogwarts. If I am not mistaken we decided that we all wanna start in the same year, to make it easier to interact with each other and have a reason to do so. I will check in with the GM to see if the decision is final, but you might be asked to change her age to 11. You are allowed to play a teacher, though have in mind that teachers don't have much of a reason to be part of the adventures that the GM and the co-GMs think up for the students and might be a little 'left out' of certain situations.