As for the paint, you'll probably want 2 things-- one for your face, and another for the rest of your body.
For your face, you'll want a theater-quality paint that will stay on. Mehron's paradise line (which is what I have on in my icon) works really well even in heat/humidity. Ben Nye is also a solid choice.
PAX is the way to go when it comes to painting the rest of your body, though. Note that body painting like this will mean it'll take you a few hours (yes, hours!) to get your whole cosplay on.
Personally, I'd invest in a bodysuit of sorts so that you could just paint your face/hands. A bodysuit would also give you something to attach Stitch's extra arms/spikes to, if you were going for that.
Good luck, and can't wait to see it!
DeviantART // Tumblr // Facebook // Instagram // YouTube
- Director Lucretia (The Adventure Zone) : 15% (Prop Work) Arisia 2018
- Paladin Armor Shiro (Voltron: Legendary Defender): 11% (Patterning) Katsucon 2018
- Arsene (Persona 5): ??% (---) Katsucon 2018
- Uniform (Little Witch Academia): 18% (Sewing) ???