I've decided to widen the scope of the game a bit and expand beyond the original four races plus subraces and things got a bit out of control!
Now there's six new races to play: half-elf, half-orc, tiefling, aasimar, kobold and bugbear. This opens up some interesting new character builds:
* Kobold rogue - high natural dexterity makes a natural fit for a rogue, but the pack tactics trait synergises really effectively with sneak attack. When you and an ally are both next to a target, you get advantage on your attack from the pack tactics trait and the bonus damage from sneak attacks which becomes very powerful.
* Bugbear fighter/rogue - the key feature of the bugbear class is natural reach on all weapons and bonus reach using weapons already with that trait. What it means is that you can be a great weapon fighter and use a polearm to hit monsters 3 squares away. Or you can be a rogue with a finesse weapon and sneak attack from 2 squares away. Both builds become excellent support fighters because you can always attack over the heads of your allies who can take the brunt of the damage for you.
* Half-orc fighter - this build makes for a really powerful and direct fighter. The savage attack trait means that when you roll a critical hit, you roll an extra die of damage so you hit extra hard, particularly when combined with the fighter's improved chances at critical hits at higher levels. The relentless endurance trait gives you an extra buffer before being knocked out. Knowing that you can drop to 0 HP once and automatically be given 1 HP to keep fighting means that you're extra resilient in the front of a party.
* Aasimar are still under development, but they are already useful support characters no matter what class you choose. The healing hands trait gives you a once per rest ability to heal damage up to your character level. It might not seem like much, but it can revive an unconscious ally during combat which can make all the difference.
* Tieflings are also still under development, but a race with darkvision, fire resistance (still a work in progress but will be really helpful to survive enemy spells) and high charisma is a versatile choice for any class.