We all know that Matthew can imitate anyone and anything possible. However, he hasn’t done any recently. Well, the following information could be the reason why.
When Matt became aware that other people were bullying him, he isolated himself from society. So in a desperate effort to not feel lonely, he created three imaginary friends who were also as weird as him. These seemed to have worked until “The Mimicking Incident” occurred.
Unlike his other alter-egos, Matt gave those imaginary friends multifaceted personalities, rather than one-dimensional. This ultimately caused them to become sentient beings with their own wild traits, in addition to their originals. Him feeling lonely when creating them also helped too.
While it did take Matt a long time to accept his headmates, he eventually decided to help them be their best selves while keeping them in check. Because he doesn’t want another incident ever again.