Golden Chestplate

Your vote count as x2 WHEN THE CHESTPLATE IS EQUIPPED

Diamond Chestplate

Your vote count as x3 WHEN THE CHESTPLATE IS EQUIPPED

Crossbow

You get a one-shot crossbow to kill a player

Netherite Sword

You get a one-durability netherite sword to kill a player

Minecart

Right-click on a player to grab them on your head until the votes are over

Red X

Right-click on the item when in a game (in the crystal of course) to block this game from being chosen by anyone in this round (players inside of the game will be teleported back at the center) 

Yellow and Blue arrows

Right click to swap the players and the spectators

#1 in yellow

Right-click to choose the game (only one able to vote)