The spirit reaches forward and touches a water claw to Kaede's forehead.
It's - a new qualia, like a hot rushing tingling, on the border of 'what a rush' and 'too much - painful'. It's like opening your eyes on a bright day, except not. It's a lightness in his skin that wasn't there before. It's a distinct sense of becoming something else, something more. It runs over his head, tingling intensely, before going down his neck. It stays most intense at the border as it runs down his torso and arms.
His clothes change with a wave of color as the process passes over them, transforming to an androgynous sort of vest-and-shirt combo, with surprisingly comfy sort-of-dress-pants, and a pair of white gloves. The whole thing is dominated by the color white, and there's silver trim here and there - but it's rather plain compared to other Spirit Bearer raiments he knows of. It will get more elaborate as he grows in power and is supposed to reflect his abilities in some way.
And then it's done, and Kaede is magic and his magic is obvious he can summon a spear or a bright light or - just change...