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Holly Koopa is a female Koopa Troopa who appears to be rather wealthy. She is found during the events of Mario Party 8, on the board Shy Guy's Perplex Express. If the player lands on a ? Space that resides on the top of the train, a Shy Guy will appear, announcing that Bandit or Mowz has stolen Holly Koopa's candy. The player must remember which car they last saw Mowz or Bandit riding in. If the player answers correctly, the Shy Guy will award them coins (20 coins in the Party Tent, 10 in the Star Battle Arena). Another question mark in one of the rooms has Holly Koopa asking the player if she could have a piece of candy if they have any. If the player says "Yes", she will pay them coins in return. The number of coins she gives them is dependent on the cost of the candy in the Candy Shop.
Holly Koopa appears in the fourth match of Star Battle Arena. Here, she plays a major part in the battle. The player who has 50 Coins and trades them to her before their opponent does will be Holly Koopa's number one fan, get a Star from her, and win.
The Shy Guy conductor of the train states that he has a large portion of money, and that he is a big fan of Holly Koopa; however, he is too shy to meet her. In Star Battle, when the player meets the Shy Guy conductor, he will give the player ten coins to give to Holly Koopa.