Otto did not see a release inside of the original online game. They instead made their obtainable debut in Moshi Monsters Egg Hunt where they can be obtained by daily egg hatching.
Constantly exploring the frostiest outposts of the world of Moshi, Sub Zero Heros love climbing snowy mountains, traversing icy wastelands and throwing snowballs. When they are not building igloos or ice fishing, These brave Moshlings enjoy fish finger hunting in treacherous frozen food aisles.
Musky Huskies and hot water bottles.
Fingerless gloves and sushi.
- A blog affiliated with Mind Candy and Vivid Imaginations took part in the Series 10 Figures countdown and stated Otto to be common in rarity. Blogs taking part in the countdown were allowed to personalise information they were given, and as no other blog posted Otto's rarity, it should not be considered as confirmed, but rather likely.
- Otto's rarity is internally referred to as rare in Egg Hunt, debunking the post until proven otherwise.