Welcome to the Lake of Rage. Here are the homes of many Magikarp and Gyarados.
There will be 15 slots in this game. There are only three roles;
Magikarp - The most common role. Magikarp can splash one person during the night. Splashing does nothing, but if you splash a Gyarados, you die. Magikarps must team up and share who they're splashing to root out the Gyarados and lynch them. Sided with Magikarp.
Gyarados - Can kill one person during the night. Use this in a clever way to frame the Magikarps. Shares a kill with the other Gyarados. Sided with Gyarados.
Shiny Gyarados - Can kill one person during the night, but gets a separate kill from the other two Gyarados. Sided with Gyarados.
There will be 12 Magikarps, 2 Gyarados, and 1 Shiny Gyarados.
There is a night phase where all the killing happens, and a day phase where you can lynch one person.
NOTE: to differentiate this from Mafia, your vote is permanent and cannot be changed, and you cannot vote No Lynch. However, you can choose not to vote at all.
Magikarps can claim and say they're Magikarp. (Gyarados can too... but you probably don't want to because you're bad.)