Replacing the map in Arcade Mode: The four C's.

Own

Moderator
Replace the world map in Arcade Mode with a giant corkboard divided into four sections, each with their own completion %.

Community: How many NPCs in total you have recruited into Arcadia, as well as how many quests you have done for them.

Culture: The overall development of the town. Counts fish caught, unique pets tamed, building progress.

Challenge: Counts how many S-ranks you have at the arena, how many shield trials you have passed. (Also potentially if you have reached at least floor # for each of Bishop's challenges / Muffin's Treats / Candy's curses, at some point in the future?)

Champion: How many unique challenge rooms you have passed, how many Double S-Rank unlocks you have acquired, and the furthest floor you have reached.

Can't hurt to let people see just how much progress they've made.
 

Own

Moderator
Assuming they're holding rewards back for things like that until the game is done and all bosses are in.
 
Top