I honestly use the wild magic sorcerer because of the absolute chaos it causes. Probably the most fun I have had with a class.
The light armor was more for the visual aspect of it... I just hate robes and unless I move around naked I can't cast any spells until I wear something I am proficient in.
Wild mages are lots of fun.
I think considering the EA is still limited to lvl 4 I'd just take the lightly armored feat, which gives both +1 dex (or strength) and armor proficiency. I think any race can work with that, considering you can also get +1 cha from Volo's eye.
