The Dice Conquest games are a pair of lightweight D&D-esque card games with polyhedral dice chucking and manipulation. They play 1-4p (I play them solo, but recommend using at least two characters).
- https://boardgamegeek.com/boardgame/354866/dice-conquest
- https://boardgamegeek.com/boardgame/427713/pathfinder-dice-conquest
I have no clue about 8-year-olds. These games suggest 10+ years. They’re not complex games, though, so if the kid is into the theme and the dice-rolling (as distinct from the actual role-playing) then I reckon these might be worth a look.
More details at Recent Boardgames (Your Last Played Game Volume 2) - #9168 by Phil