Interesting, and always remarkable how the art has changed. The later characters (Wilsow, Penny, Tai, Meena) seem set from their first appearance, and Hannelore is settled since she got her haircut. The others would hardly recognise themselves.
Whenever I see the title "Evolution of martin" I think he starts out as some kind of lizard or rat, and is destined to ascend higher state of existence as an energy-being.