Ok, so we all know chaos is basically manifested emotion.

My question is "Why is there not a god of hope, happiness, and joy?"

We already have all the negative emotions covered hate, lust ext.. So why is there not a good chaos god?

Some could say the emperor was, or is the closest thing to one. However he was/is only a source of inspiration or power to humans while the other chaos gods can be worshiped and have been worshiped by almost any and every species.

(Im not saying the emperor was a chaos god but he is the best example we have of a "good" power in the warp.)