Technically everyone is everyone else, if you believe in infinite universes. If there are infinite universes, then all possibilities must be realities. Therefore, if it’s possible for a parallel to exist where one being is basically a combined version of two separate characters, it must exist in some universes. There is some half Shrek half Discord monstrosity out there in the multiverse, making Discord a parallel of a parallel of Shrek. Moreover, everyone is a parallel of a parallel of Shrek.