I have this image of a battle hardened warrior, pushing a baby cart, from time to time little explosions of flame burp up over the sides of the cart. sweet….
Or then, you could open an orphanage for all the abandoned half dragon kids. — Why was Tyler Durden building an army…. ;)
I wonder if you could make a mad scientist class, where you get to create all sorts of abominable cross breeds. Would have to be lawful evil. The cantrips like mage hand… could be used to alter in-utero DNA… Animate plant spells, specialised scrying, control water to selectively lyse cells or alter the osmotic properties of the cell wall.