Material Lifeform

Material Lifeforms are lifeforms that are completely dependent on their Material Body with no spiritual qualities. They only exist in purely physical worlds without any Magicules.

Background
Within the series there exist three different types of universes or "worlds". There are Spiritual Worlds, Material Worlds and Demi-Material Worlds, divided by the nature of the natural laws they follow. In purely Material Worlds, those that are bound by their flesh and follow completely material laws are Material Lifeforms.

Properties
Material Lifeforms possess no spiritual qualities, though they do still possess a Soul. They are completely bound to their Material Body, relying on things like biological functions and being subject to lifespan.

Trivia

 * The only time that purely Material Lifeforms are seen is in Rimuru's original home world, which is the only known world that is entirely physical, without any Magicules or spiritual qualities.