my “glasses” for the ego boost

or the treasure trove chest maybe
or maybe blue and green stickfigures in a forest

I would say firstly, most if not all of the trophies could work. (Excluding Goku’s boot in some cases for copyright)

For users without a trophy,

Any of Gigan’s Posse member’s masks

Mellow’s fish bow helmet or the jester hat/hoodie

Anomaly’s jacket

Any weapon from K-Zilla’s series

While LuLu may not have many iconic existing items, I’m sure a chef hat or apron could work

Mattsteady’s cape

To include myself, Flame’s collar or shades, Humble Damien’s bucket hat (as Anomaly also said), Moken’s blindfold, Pneuma’s bandana, Mix-Deck’s headphones, Old man’s robe, or Minor Heart’s Glass eye.