Hello Fighters Day. Thank you for the questions. To answer the first question, yes, this is a fangame. The Multiverse Rumble series has no intentions of stealing characters, as they are for fair use. Stealing characters like Yakko, Donald Duck and Thomas The Tank Engine is the least of my concerns. Bear in mind this game runs on the MUGEN engine, which has many characters made for the engine, so all in all, Multiverse Rumble is a non-profit, fair use series that has no intentions of stealing characters from other big corporations such as Disney, Nintendo, Warner Bros etc. Have a good day and I hope this answered you're question.