he's a fan of joker and harley quinn, so ill try

so i read to him the harlequin wikia entry, he found it interesting, i'll read to him more later. sadly they are not in any movie or game

you can try DOW2 elite or some day soon eternal crusade

(double post sorry)

wait a better idea
show him alfabusa's Text to speech series

maybe its best i wait until he knows the universe well enough to get the jokes

Nothing wrong with that, it's one of the best video game series ever created.

... yeah actually, zog him.

Wait...there's a GK dreadknight in DoW III?

If anything throw him at the Orks. Impossible not to love the green gitz.