A scientific analysis crew of aliens hire a human bodyguard. The human has a strange power over fauna, as in they become friendly/borderline domesticated like earth pets. The human is confused as it's happened in many planets/stations. Meanwhile the scientists are having trouble between making sure to get the data and making sure the human stays on as a permanent crew member. -- Anon Guest
It is a known rule of the universe that Humans will attempt to pet anything. Humans may also attempt to tame anything that crosses their path. They're a friendly species, and spread their pack-bonding to any creature that responds to them. Many are willing to fail at the attempt.
One is more successful than most Humans. They have a knack for interacting with non-cogniscent creatures beyond that which should be logically plausible. They went by Human Stu (because they were 'cookin', they said) and spent a contracted twelve years with the crew of the Non-invasive Probe. Twelve years spent capturing, examining, and releasing every single creature the crew could find on a planet in orbit around TGD-WE4-876.
Human Stu was there to keep the scientific analysts safe from the creatures on the planet they were surveying. They chose to do so by being unbelievably friendly with every single one. Humankind were immune to any venoms and poisons on that planet, but no such venomous creatures attempted to harm them. They were friendly right back in return. It was uncanny.