This mob would be a baby zombie called 'cuddle' that cannot do damage and doesn't burn in sunlight. It has love hearts above it's head and follows you around. If you try and kill it, it simply multiplies at a ratio of 1:3 (1 harmed cuddle splits into 3 cuddles). It would have 50 health and if you manage to kill one after being swarmed, it would drop shiny flesh, zombie viruses and all sorts!
This would be cute; however I don't see a real purpose to it? Otherwise, if there comes a use for these, then yeah, I wouldn't mind these little critters crawling around.
How about a cuddly creeper? Cuddles up next to you. Once you look at it, it gets embarrassed and explodes. BAM! Valentine's Mob.
As SkyDragon said above, it's be cool as a special mob for a small amount of time. But I don't think it'd have a porpoise/purpose in our everyday life.
