The Journeyman Prodigy Viburnum

One dimension, two dimensions, three dimensions, seven. You are a child genius who theorized how to access the seventh dimension. In your spare time you compose piano music in the beautiful music genre. Even though you're smart, you're still a kid and enjoy movies about yetis and baseball. You do part time work for The Venenum Republic because they offered you a near unlimited supply of pet cats.