I'm still ironing out the kinks of my magic systems, so a lot of things are subject to change, but for the main magic system in my story: magic comes from the stars, generated as mana and channeled by the magician through a "medium", traditionally though magic staffs but usually wands, however anything can be used as a medium (a character uses a sword, another uses tarot cards, which take on the appearance of playing cards in their world). As a result, everyone kind of has a different way of doing it, but the result is usually a glow/aura around said medium called... well, an "Aura". The shapes and colors are dependent on the user and their personality, for example, one of my characters, Jupiter, his Aura color is red and takes the shape of something that looks like lightning, while his brother's is more of a calmer, regal, blue aura. I wish I had photos to describe this part better, but I still don't.
In the REALLY old days they used to use runes, but that's spoilery and I'm keeping it under tight wraps so I'm not talking about it, lol.
Other magic systems in the story work like:
one magic system that only works if you use something, for example, picking up a flower from the ground requires you to use a bit of mana to heal the flower, which means that the magic is really only effective for healing.
Another is centered on illusions. You can only change the appearance of yourself and not the surroundings around you, and mana is generated from the user themselves.