Scalies such as dinosaurs or lizards were supposed to be included as customizable characters but were cut because the developers wanted to focus on furries.
Other animals like sheep, goats, elephants and more were supposed to be customizable characters but were cut because the developers thought they would be "too animal".
Pokémon and Digimon were going to be licensed for use as customizable characters. However, Nintendo and Bandai Namco turned them down, respectively. Unfinished Renamon, Lucario, Lycanroc and Zoroark character models could still be found in the game files, though.