my suggestion for Daily Reward is a package contain random coin between 1-5.
With this coins players play a slot machine game with random reward, the reward can be something in cash shop, but every thing is "inbound character" (cant be traded or store to storage), it can be pets, HBP, FAW, and costume.
The slot machine offer 3 tier option, and each option require different amount of coins, more higher the tier more coin needed, and more worthy the prize.
The prize it can be anything except buff or consumable item, the slot machine had no limitation, as long as you still have coins remain, you can play it so many times.
any question just ask me.