A Few More Tips

For weekly/monthly quests, even if it's a hassle, make sure to watch ads for the double reward! Daily quests have low rewards, so they're optional. Also, if the enemy formation is mostly melee, you can chip away at them with AoE characters while kiting with a melee character that has good mobility. This can help cover some characters that would otherwise be easily defeated. For magic, slow or stun effects are a must!