I'd be a bay frame mixed breed, shorter than average [ie just shy of 15hh - I'm 5'2"-ish which puts me at 15.2 in real life but that's pretty average horse height in my eyes], built like your show-ring Egyptian Arabian [meaning VERY slender and narrow with dainty limbs] but with the speed, or rather lack thereof, of a draft - I'm built for stamina not for speed! Kind of plain through the face, not a show pony, and my mane and tail are CONSTANTLY tangled and full of hay and burrs.
Not a runner, not an endurance prospect by any stretch of the imagination. I HATE flatwork so I'd be extremely ring-sour, like to jump but not great at it so I'd make MAYBE a 2'6" horse, love a leisurely stroll along a trail... or a short gallop down the beach. REAL water-baby, just try to keep me out of it! Until you want to bathe me in which case watch out, I'll take your head off. I'm a big dustball and that's just the way I like it. Very messy eater not out of inability to be tidy, but rather a total lack of motivation to!
Dominant bitch mare, with my own subtle and not-so-subtle ways of ensuring that I do what I want to do unless I feel like doing as I'm asked for once. I'd be REALLY stubborn and occasionally oppositional, and crazy hot on the wrong feeds but manageable on the right stuff.