Since it is relevant, I'm thinking my 'guardian' character will be basically a kitsune, so it's magic will be Illusion. In this I am thinking in terms of how Kitsune lore is, where they can create illusions that become a reality. Obviously, my character will not have this strength right away, like you said growth is key. I will also be taking into account the lore surrounding Kitsune tails, how their tail number corresponds to power (among other things I won't worry about). However, my character won't actually be Kitsune, it will be whatever these 'gaurdians' are considered, just so I can have a bit of free range with them and not worry too much about the inner nuances of Kitsune lore.