Horses

Horses are a species of creature native to the planet Earth. In relation to Blaseball they are not allowed and in fact it is illegal to have a horse at a Blaseball game or invite one into a Blaseball stadium. The reason for this is Cited in the final chapter of the Book of Blaseball and relates to the events of opening the Forbidden Book. Horses, being mostly comprised of multudinous gasses are unable to appreciate Blaseball, cannot comprehend integral statistics, and are impossible to control when exposed to a Blaseball pitch.

Horses are the only entity currently capable of chewing Gum and are immune to the Gum Curse, so they may appreciate some aspects of blaseball.