I thought Alister was just like Obi-Wan Kenobi from Star Wars Ep. 4 as he was one of the only lombax survivors in Polaris, just like Obi was the second-last jedi in the galaxy.
They both had fled their galaxies emperors, Alister had fled Tachyon and Obi-Wan had fled Darth Sidious aka Supreme Chancellor Palpatine. They both had also been helping them, as Alister once helped Tachyon and Obi-Wan helped Palpatine, though he was suspicious of Palpatine's goals.
Even more, both Alister and Obi-Wan hid to a desert planet inhabited by creatures that collected trash. Both of them took care of another of their kind, Alister became somewhat Ratchet's mentor and Obi-Wan took Luke Skywalker as his apperentice. Both of them had been also friends of their apperentices' fathers, although Obi-Wan had to fight Anakin. Lastly, they both set on a galactic adventure and helped saving the universe.
On a final note, I find the Future trilogy being a lot Star Wars -inspired. The plot of betrayal by one whom the protagonists helped, the massacre of the protagonists, the empire ruled by the betrayer and the fall of the betrayer by one of the few survivors is the same in both stories.
Though Alister fights more like Yoda than Obi-Wan. And the final showdown between Ratchet and Alister has nothing to do with the plot of Star Wars.