Crown

While playing a level in multiplayer, the currently highest scoring player wears a golden crown. If another player overtakes them, the crown will transfer to them and they will say a special voice line.

"It didn't suit you anyway!" - Lemon

"Anomaly corrected!" - Aubergine

When the level is complete, the Crown-wearing player speaks the boss dialogue (if playing a boss level), and becomes the focus for the Score/Rank screen. The other players are free to move around and fire their weapons during this screen.

The Crown doesn't have any gameplay impact, it's just there for bragging rights and to motivate the players to try their best.