This is an odd design. I named them Tokemi. A Time Mage. If anyone needs to know what a Time Mage does, well...They manipulate Time and Space to their advantage and to aid allies as well. Though, as usual, with me it's not all that simple. (Time and Space isn't simple anyway..) She's able to manipulate all things around her, within a certain radius of course. But it is quite huge. Slowing time down for one person would reduce their size for a certain amount OF time. (Slow.) Speeding up herself and her friends would serve to enhance their size as well. (Haste.) And a pretty weird ability to manipulate space matter and materialize it to bring it down upon her foes to cut their power in half...And size. The reduction is relative to how big they are, so she can keep halving and halving size and that foe would never truly disappear. (Gravity.)

Also beware because she knows the most powerful versions of these spells as well. Wouldn't want to get shrunk, perpetually, out of existence so very slowly, nor would you want to face someone who's speed doesn't match their size as they outgrow a city to utterly overpower you and you definitely don't want to have literal space smush you down to some itty-bitty, scrawny, hopelessly teeny, tiny, little fleck.

...Of course you would~