2 things.1-After reaching 6Path Sennin 3Star, there really isnt any use for arena, if ppl want to test combos, there is kakashi in town and it scales to your level so it is more realistic than arena, so i suggest adding more ranks, or Daily rewards for the rank that you are currently at. something to make arena non-obsoliete

2-Arena dailies. Arena dailies are way too few in number, we only get 2 each day, with a total of 400points, sometimes its points that are unclaimable and we have to halve them in order to achieve what is nessicery to obtain them. i suggest adding atleast 2 extra arena dailies and also to make sure that the player can actually achieve the mission.
To some the arena challange *Fight with 3 Akatsuki Members* might aswell be, *create a time machine, fly to the moon,become god, and spend $100.000.000 TO GET ALL THE AKATSUKI*

Thankyou for reading =)