User blog comment:DYBAD/Character Sheet/@comment-26362471-20170428191432/@comment-4867780-20170503091655

An excellent point ^ ^

The core defining trait of Selforge Materium is that it is animated by Lawrence's sentience (unlike Selforge Technologies which operate on a subconscious basis), that's what allows his avatars to truly feel like his own "flesh and blood" bodies rather than disposable vessels. That's also what grants it such extreme flexibility, the Materium constantly shifting attributes and properties in real time to reflect his every thought and desire, essentially materializing his own self-perception.

For this reason, it technically cannot make up Sisters and Citizens' physical bodies, since these are already animated by their own personal sentience. Still, the individual Selforge Citizen Essence hosting their soul and permeating their body is programmed with similar albeit more limited functionalities, notably due to the dehumanizing potential of unrestricted shapeshifting. So there isn't much perceivable differences in practice, except they aren't quite as "high level" as he is.

Mostly for fun as mentioned above and to make specific impressions, since the Materium can directly replicate any available effect/ability regardless of the form it takes.