Tobias Beckett is a fictional male in the Star Wars film series who was portrayed on screen by Woody Harrelson. Tobias Beckett name doesn't sound very sci fiction does it. Although you did have Luke as in Luke Skywalker so I guess anything is possible.
Han Solo first encounters Tobias and Val on the planet of Mimban where the Imperial Army are try to beat the inhabitants into submission. Han notices that Tobias and his friend Val are behaving strangley and surmises that they are in fact thieves trying to steal from the Empire. Han wants in but Tobias refuses and get Han thrown into a pit where Han meets Chewbacca for the first time.
Han manages to befriend Chewbacca and escape from the pit. When Tobias is leaving the planet, Han and Chewie wave down Tobias and Tobias agrees to take them with him to Vandor. On Vandor, the group plan to steal Coaxium from a high speed train but due to the interference by Enfys Nest, the operation fails and the Coaxium is destroyed. During the time on Vandor, Val is revealed to be Tobias's lover and who sacrifices her life for his.
Tobas, Han and Chewie visit Dryden Vos, the criminal who had hired Tobias in the first place to plead for a second chance which they get. The second mission is to steal Coaxium ore from Kessel and get it refined. They first need a ship which Qi'ra puts them in touch iwith Lando Calrissian. Han tries to win the Millennium off Lando but Lando has cheated. The group persuade Lando to come with them.
The misson to Kessel and then to Savareen is a success. At that point, they are confronted by Enfys Nest again who turns out to be female. Amongst the group is Weazel, played by recurring actor, Warwick Davies.
Tobias warns Han that he'll be betrayed and to expect it so that when it comes, Han won't be disappointed. On Savareen, Han is betrayed by Tobias and Tobias ends up being ultimately shot and killed on Savereen by Han after dealing with Dryden Vos.