One, is the oldest of the siblings, and by about 3 seconds as she says to her brother Four. Her age is never mentioned.
- One is voiced by Joanne Vannicola. She will be voiced by Miranda Cosgrove in the reboot TV series. In the UK version, she is voiced by Emma Tate.
- In the original book by Maurice Sendak, One is introduced with the line: One goes up.
- She looks to be a piasa-like monster that can fly. She wears a pink hat with the number 1 on it, a pink and white striped tank top and dark pink shorts. She has fur mostly covering her body, except that her legs that appear to be like those from a chicken.
Also Known for Stephen Squirrelsky:
- She is also one of Stephen and Andrew's friends.
- Other than being a little bossy to her siblings, she is a nice person to them and others. She is a sporty type, and sometimes uses her wings to fly while playing sports or games with her siblings and others.
There have been times in which One can be a tad naive. In one episode, she says she thinks she can fly to the moon.
- One seems to be a bit of a neat freak as she likes things organized and once had a nightmare about dirty halls.
- One also dislikes it when none of her siblings listen to her.
- One seems to have a bit of a rivalry with Four as the two of them often argue over who should be in charge. One insists that being the oldest (by a few seconds) makes her a better candidate for leadership.
- One is shown to have a love for basketball.
- Her and the other monsters' appearances in the Stephen Squirrelsky and Friends' Movie Spoof Travels areCub and Company, Happily Ever After (Stephen Druschke's Style), Hoodwinked! (Dalmatian Tunes' Style), Beauty and the Grizzly Bear, The Rescuers (TrainBoy43's Style), Nikki's Adventures of Sing Along Songs Episode 4, The Rescuers Down Under (TrainBoy43's Style), The Secret of NIMH (Nikkdisneylover8390's Human Style), Nikki's Adventures of Sing Along Songs Episode 6, The Little Mer-Lioness II: Return to the Sea, Skunkules, Home on the Range (DalMatian Tunes' Style), Kermit's Winter Wonderland, The Little Jungle Boy, Kermiladdin 2: The Return of McLeach, AiAi the Monkey and A Day for George, The Reindeer and the Deer, Animal Story 2 (Stephen Druschke's Style), AiAi's Grand Adventure: The Search for Tails, A Cartoon Character's Life, Nikki's Adventures of Sing Along Songs Episode 7, Here Comes Winnie the Pooh, Animals, Inc. (Dragon Rockz's Style), Simba 2, Miss Bianca and the Bernard 2: Fievel's Adventure, FernGully: The Last Rainforest (Dragon Rockz's Style), A Pooh in Central Park, Bubblesrella 2: Dreams Come True, The Brave Little Piglet, Kung Fu Owen, Nikki's Adventures of Sing Along Songs Episode 8, The Thomas O'Malley Movie, Kermit Returns, Fievel the Red Nosed Mouse and The Island of Misfits, Nikki's Adventures of Sing Along Songs Episode 9, A Cartoon Character's Life Activity Center, Cloudy with a Chance of Meatballs (Justin Quintanilla's Style), Finding Alvin (J.B. Eagle's Style), Animated Tale (TheTure DisneyKing's Style), The Forest Book 2 (TrainBoy43's Style), Nikki's Adventures of Sing Along Songs Episode 10, Madagascar (FamousImagination50's Style), Sleeping Beauty (Justin Quintanilla's Style), Aurorastasia, Despicable Me (Justin Quintanilla's Style), We're Back!: A Jungle Animal's Story, Jimmynocchio, and The Wizard of Oz (Uranimated18's Style) and will even be in more movie spoof travels.
1's Animal Counterpart
1 as the Hippopotamus
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