A Leafman is a small Passive Creature that roams around Fortuna III.
Leafman are common in area's with a lot of Flora, like the Jungle.
There is no way to kill or damage a Leafman in game.
Trivia
In the Prospect Station a Leafman can be seen on top of the Osiris Station
When crouched repeatedly next to them, they will give off small pink hearts.