Shiryoku

The hardest enemy to fight is yourself, these magic users have taken that old saying to its conclusion by making any combatant fight themself. They do not study their own magic but have found a magic that can copy others and they can use spells by just watching someone cast it once. Years of study can be mimicked in a blink of an eye literally. Bewear these casters for if you use your trump card be prepared to get it thrown right back

copy sight

You can copy spells and martial techniques you can see, you can copy up to 3 spells(these spells can be cast like cantrips and have infinite spell cast) or martial techniques and you get an additional copy each level. to copy a move you need to spend your bonus action to do so. You can also unlearn something to add more room to your copy list, this will take your action to do so. You have no spells of your own. (max at 8)

Burning sight

you can use a spell slot to make one of the spells you copies one level of spell casting level higher. 

Mimic clone

You can copy one of the enemy's total being and make a clone of them that follows your every command for 2 turns. Can only make a copy of creatures medium or smaller. (at 20th level this turns to large or smaller)

Shadow clone

can make 2 copies of the user and has all the spells, has individual turns