I think it's about time we get one. Here are my 3 main ideas, but feel welcome to add more in the "other" selection.

Unarmed: I think this one is self-explanatory. Lots of bonuses to light and heavy attack damage through perks, fist weapons like in Diablo 3, one or two kick-related abilities, one or two grapple abilities, a quick punching barrage ability similar to DW's first skill except with punching sound effects.

1H&Spell: Some utility spells that are cast with 1 hand such as a ward or a barrier that lasts a few seconds along with the 1 arm animation, boosts to your physical weapon when a spell is casted, animations for 1H attacks/skills that go well with the animation of your other hand while having a barrier or ward up. (the barrier/ward animation would consist of the model keeping their arm extended in front of them throughout the duration of the effect while other spells or light/heavy attacks center around animations in the other arm. Or have the model hold a book, scroll, rune, or sphere the entire time). This skill line would be similar to how healer Templars work in the sense that they're healers (utility) and still have their damage because they center around magicka, except this will be physical for contrast. Could also be magical by having the weapon deal magic damage and be a Bound Weapon while having offensive spells.

Bound Weapons: This one could easily be a copy/paste of the DW and 2H skills except with magic damage instead of physical and with the weapons formed of a purple aura (base color) like in The Elder Scrolls V: Skyrim. Could also just be its own thing entirely so long as it adds more options for mages.