Mille Marteaux
Empress of Light
These are much less frequently seen than the Pet (Guardian) and Chestpiece (Blaze) slots are, and it would make it much easier to color coordinate your costumes around them.
As an example, I like how my Black Cat looks with Violet and Silver Dye, but my Guardian looks extremely tacky with it.
Meanwhile, I think my Guardian looks cool with Nebula Dye, but then this affects my Black Cat in a way that it looks somewhat similar, but the hat, body, and eyes are now a sharp shade of purple and the color balance of the Cat is off for the vibe I'm going for.
Solar Blaze has similar issues, but I'm not as impacted by it on my current melee loadout's vanity as I am by the Guardian on my summon loadout, so someone else may have to chip in their grievances with it.
(I also think it'd be neat if you could hide the Guardian when outside of combat, but that's a different suggestion.)
As an example, I like how my Black Cat looks with Violet and Silver Dye, but my Guardian looks extremely tacky with it.
Meanwhile, I think my Guardian looks cool with Nebula Dye, but then this affects my Black Cat in a way that it looks somewhat similar, but the hat, body, and eyes are now a sharp shade of purple and the color balance of the Cat is off for the vibe I'm going for.
Solar Blaze has similar issues, but I'm not as impacted by it on my current melee loadout's vanity as I am by the Guardian on my summon loadout, so someone else may have to chip in their grievances with it.
(I also think it'd be neat if you could hide the Guardian when outside of combat, but that's a different suggestion.)
zenithspeed
The Destroyer
a way to hide the solar shields would be nice too