Navin
MALDREAD
You mean that kid in the orange sweater who has big eyes? I'm not sure if he's a recurring character; at best I'd say he's a COTD/someone who will show up often during the Battle Chateau episodes. I think it's way too early to tell if he's going to be an important character throughout the saga just because of his appearance though.
I highly doubt Youngster Joey is going to become the rival...definitely just a COTD.