Beyond The Wall is a reasonably lightweight game with a fun character-creation minigame (you're rolling in tables that might say things like "The character sitt

Beyond The Wall is a reasonably lightweight game with a fun character-creation minigame (you're rolling in tables that might say things like "The character sitting to your right knows your deep dark secret" and then the two of you can work out what that is). It's also got some tools to help the GM build adventures, which should be helpful. In general, almost any game should work at that age, you just have to be prepared to adapt. Plenty of 8 year old kids have picked up their older sibling's D&D book and played with their friends, having a lot of fun even if they're not calculating Base Attack Bonus properly. Kids are imaginative, so I'd try and encourage roleplaying and worry less about the pure mechanics of rolling dice, which is easy to screw up. Biggest advice: make sure you understand the magic system well. Even among adults I've seen confusion about how exactly spells work (for instance in Beyond the Wall, there's cantrips which always work and spells which have a % failure chance, and that trips people up)