But as for clothes, he's dressed in this (Outfit Three). His hair is loose, just because he hasn't quested for a hair-tie or anything like that yet. It's neatly combed and cleaned, maybe cleaned with soup. Still, clean enough. Might or might not have traces of bruises on his hands. Probably not, because Aather!Ryner healed them. Eats well enough, so there isn't any problem with that. So overall, looks canon. Well, his hair might be getting a bit longer? Probably not yet. It's only been few weeks.
Manners: He might be even more touchy-feely than in canon if he likes you. On the other hand, he'll ask (or at least warn) before hugging you (or kissing you, because it's almost one and the same to him. Yeah, he'd love mistletoe.) Also, more perky than canon Dio somehow. Perks of being an amnesiac.
Remembers a tiny little bits about himself, Lucciola, Claus, Fam, Giselle, Alvis, Tatiana, Delphine.
Might die of happiness upon seeing any flying vehicle. (Well, not really. But good luck trying to keep him from it.)