I would recommend giving Kido a leather armor that does not provide any substantial protection (just to make it fun, maybe give it one magical property?) and which does not disable his mage spells. Just so's he will have a hooded thief's appearance. Kido has a hood in his inventory, and his portrait is hooded, after all.
Btw, I installed Song and Silence. I just added the 'bardic store and thief items' component, which adds a store that includes 'bardic leathers' with which Kido can spellcast and gives him a hooded avatar.
Hm, I wonder how they made that happen. Thanks for the information.