I'm thinking of creating some unique fighting styles, dubbed Arcane Fighting Styles for my Mage Knight (I know the name will annoy people). At 10th level, the fighting style improves. I know these aren't perfect, but it's a start and I think unique fighting styles like this can help create the image of someone who fights with sword and spell.
Arcane Fighting Style
2nd-level Mage Knight feature
Ranged spell striker. Your ranged spell attacks have a +2 to hit.
Spell Duelist. When cast a spell that deals damage to a single target, you deal an additional 2 damage.
Staff of Defence. When wielding a staff arcane focus and no other weapon or shield, you gain a +1 bonus to your AC. You can use your reaction when hit by an attack to gain an additional +2 to AC.
Wand Strike. You treat a wand as a martial weapon, with the light and finesse properties, which deals 1d6 energy damage (chosen when you create or buy the wand). You may use intelligence instead of strength or dexterity when attacking with it.
Ward. When struck by a form of energy (cold, fire, force, lightning, necrotic, radiant, or thunder), reduce the damage by your intelligence modifier and add that damage to your next successful weapon attack made before the end of your next turn.
