Life in Nirvana wasn't for the weak-hearted. Despite being a futuristic city with flying cars and sentient robots, Fright City was a lawless place, and power was the only language needed to rule over the city.
Since both Ashton and Anna did not lack 'power', they easily impersonated someone he had little to no information about without anyone questioning him. Essentially, their life in Nirvana wasn't all that different from their merc life in space.
Ashton arrived in the city as an Inquisitor from the capital, but after a couple of weeks, he became known as a bonafide mercenary with a kick-ass partner.
Although he strictly used his Undead genes, Ashton was the strongest person in the city, followed by Anna. So it wasn't a surprise people in higher places wanted to connect with them.
They also wanted to work with them because it was rare to see an Undead having such a close relationship with someone on the opposite end of the spectrum.
