Plot bunnies and ideas i want to get out and about

Now i know what your thinking BuT yOu AlReAdY dId A uNdErTaLe AnD MhA cRoSsOvEr! And to that i tell you, yes, yes i did, but this is diffrent, instead of Sans AUs being reincarnated as MHA character/into MHA its Mha character reincarnate into Undertale AUs/ into a undertale Multiverse!