What does your character smell like?
Kaito smells faintly like gunpowder (fireworks), chemicals (again, fireworks), and cosmetics. The cosmetic smell is probably the most prevalent, especially around his face, ears, neck, collarbone, hands, and forearms. His bone spines might smell like paint. He essentially has the typical scents of someone who works on stage in make-up and costuming. Other aromas might include earthy tones from working in a garden, and medicinal/herbal scents from making his own tinctures.

Kid basically smells the same because they are the same person. Which your character can pick up on if you like, if they ever, for some reason, happen to get a whiff of both Kaito/Kid and remember their scents. Only difference might be the strength of the gunpowder, chemical, and cosmetic smells, but that'd depend on whether Kid's in disguise as another monster or not. I'll describe anything unusual or noteworthy in that case.

What do they sound like, generally?
Sound sample for Kaito being more screechy/panicked.
Sound sample which starts with Kaito's normal voice and also has Kid's.

As a note, Kaito is capable of changing his voice at the drop of a pin (male, female, old, young - ANYONE). But I always make a note in a tag of when this happens. Occasionally he'll clear his throat before changing voice, but not always.

Furthermore, he can also copy someone else's voice as long as he's heard them speak for a few minutes (or enough time to go through all the syllables, inflections etc.). I know, he's bloody crazy. ON THE FLIP SIDE, there's a chance he may not copy them perfectly but I'll leave judgement of that up to you.

Does your character have any tells?
Kaito's tells are mostly hand fidgeting but he tries to stuff them in his pockets to hide that. His only other significant tell is that his face goes blank ('poker faced') when he's concealing his emotions, but that's not really something a blind person can pick up...

Another way he covers his fidgeting hands is by pulling out a deck of cards or maybe a coin and shuffling/riffing or flipping them around. Considering that he's often doing this whether or not he's lying, it might be hard to tell a tell apart from...well. Just him practising. So I guess that's a case-by-case basis thing.

Any monster-unique details?
- Crow wings of typical species wingspan (50cm/20in); would definitely make some noise