The Other Survivors are groups of survivors that are scattered through-out the wasteland. So far, there have only been few encounters.
Lemonade Cultists: a cult based around an ingredients label from a lemonade bottle. They were living in the tunnel system below the ruined cityscape. The leader of this group was smashed by a burning monorail train with a jet engine strapped to the top that crashed into their 'church'. The group believed that Captain, who emerged from that train, was their "great prophet Lemonade" who had returned to make them delicious. Only after Captain treated the cult terribly they changed their mind, throwing him into the 'Pit of sugary death'. The Captain survived though, by drinking all the contents of the death pit with his straw. The group still exists, of the former (at least) 26 members only one was confirmed killed during the events in the comic (pit supervisor). It is shown that sometime in the future, a group of cavemen are worshiping Captain and spreading the legend of him escaping the death pit. Other paintings on the wall depict "A ufo landing" "A red animal being attacked by 3 warriors" "a two headed giraffe" and "3 warriors fighting a giant 3 armed monster" it's worth noting that of the 3 warriors, only one has a projectile weapon (Snippy?) this could have hinted towards The Biomass 117 attacking the squad VERY early on in the comic. See as well Cave-Paintings in the Eastereggs section.
Hostile Wastelanders: encountered by Mr. Snippy when he was out looking for supplies from a shoppinglist provided by Captain. This group had their own leader and at least 3 more members. They tied Snippy to a chair, most likely for later interrogation. When the sniper tried to escape by tipping his chair over, one of the group's members discovered him and suggested a beating. Cancer's first ever appearance interrupted any punishment Snippy may have been about to receive. It's likely that the monster (also known as Biomass 117) killed and assimilated the whole group of wastelanders at that point. It is unknown whether there are any survivors left, though the chance is quite low. The wastelanders seemed to do a good job at gathering guns and supplies, and must have had at least one working generator for electricity. Additionally they had several flasks of highly flammable substances stored in their hideout. Said hideout was subsequently destroyed in the battle between Cancer and Mr. Snippy.
UPS-Guy was hired by Pilot to deliver a note to Mr. Snippy after the Snippy was swallowed by a whale. It is unknown how or where Pilot found the strange old man with the UPS-tattoo on his left arm. The UPS-guy is pale with white half length hair, wearing black pants, green fisheye-goggles and a gasmask with a snorkel attached to it (at least for this special delivery run/swim). Additionally he had a chain with a ring on it around his neck, so we surmise that there might very well be a Mrs-UPS somewhere out there, too.
Stalky the stalker has been spotted spying on the Captain. In the moment he seems to be on a quest of his own, though, to fetch the Captain a very special present.
Many mostly intact bodies were found inside the Biomass before its destruction, including both males and females. This may mean that there were other groups of survivors around the wastelands that Zee Captain and his squad never met. It is unknown if survivors of said groups still exist, since it is highly likely that the Biomass absorbed everyone it encountered. It is possible, however, that some of its victims were mutants rather than normal humans or animals, and there is no way knowing how many of the bodies were of alien origin to begin with. The Lifealope was not able to restore any of the absorbed bodies aside from Snippy and Pilot.