Cute misfits idea: they create their own language.
Because of a few reasons.
1. Iruma speaks human language(one of it) and the demons have their own language. If ever the language spell wears out or was removed, Iruma and the misfits can still communicate with him. [This is the most important reason]
2. They think its cool. Their own language? They can talk about anything and anyone without ever needing to worry(well, unless there's a Caim fam member nearby) [This is important reason #2, because theyre losers lmao]
3. Actually wait, what if they manage to create a language the bypass the Caim family magic for some reason??? That will make their language even cooler.
4. They want to see the confused and frustrated face of Flufflego-sensei of no being able to understand them. Though, eventually, Kalego, Balam, Shiida and Opera learns the language cause they are basically Misfits' dedicated teachers at this point. Robin, Orias, Bachiko, Mephisto and Sullivan also learn them at some point because of Leid and Iruma lmao. Ameri learns it as an honorary member and her connection to some of the misfits core leaders(?).
5. Its a secret language that also helps to identify one another. In a world where magic exists and disguises can be so good that its near impossible to recognise? The language helps them communicate.
6. They also find themselves very proud of the language uwu. Their teachers cant help but feel pride and the kind of progress the misfits make, and the extraordinary things they do as a group.


















