This is a concept I have been thinking of for an Adventure Time/Undertale crossover AU. This is a RP server for this AU concept where you can RP as characters in it.
Adventure time Fans Fandom
Adventure time~ Come on grab your friends! And make some too in our Adventure time RP server! We have Canon characters available, and we are OC friendly! We're still small, but growing slightly each week! Very friendly environment, and plenty of rooms to rp in. Come in and start your adventure! 16+ please.