accessories

I really like putting Marth's mask on Brave Lucina.

It's like a match made in heaven.

Any accesory on BK, seriously, specially the diving goggles, is hilarious.

Also, I like a lot that the butterfly mask fits lon'qu extremly well as the mask's color is the same as his outfit

I put Feh on the robins and Micaiah. for double Birb power.

Let's see ...
Marth - Mysterious Mask, just because I thought it was funny.
A!Tiki - Seashell Hairpin, just to reference her beach counterpart.
PA!Shigure - Enigmatic Mask, I just thought it looked good on him.
Lucina - Askran Hairpin, same reason as Shigure really.

They could make accesories shop for arena medals and/or badges. Right now this is trash items. You could buy duplicats of accessories (you could make masked team)

Literally all of the accessories go really well on the Robins/Grimas/Morgans. Also, bunny ears on Olivia is adorable.

Marth's Mask on Chrom. He thought that pretending to be Marth would get him into Smash Bros.

I gave the snorkel to ryoma for a full lobster costume.
Other than that just to units that looked good with them, like the askran pin on celica, or the seashell to eirika.