Dento is going to be enjoyable I can already tell. Hopefully he's not sidelined too much. I'm curious as to why he joins Ash in ther first place. Maybe it has to do with him learning something after Ash beats him?
As for Iris her character is fine for now, but what is her angle? I hope they actually give her more of a reason to travel with him other than "I just want to help you find your way around." That one facial expression of hers during the battle seemed like she was amused.