You have to become a werewolf and leader of the companions to propose to Aela, so technically it's not -that simple-. But yes they could implement some relationship sim features xD
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They wear the armor with the highest base stats. A mage will wear heavy armor over wizard cloaks. They're retarded like that
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My Aela has staff of zombies, antronach summon staff, daedric dagger and daedric bow.
She uses all four weapons effectively. (Always summons a fire antronach at the start, then resurrects a ddead body if there's one. Then bow if the enemy is far away and dagger if they're close)
Gave her a full glass armor set as it is light armor (supposedly better for her? I unno wiki said she's light armor).