Rich Idiot with No Day Job: Sam might have the most shares of Encom, but he's a college dropout with no job and no social connections outside Alan Bradley and his rescue dog Marv.
Shirtless Scene: The entirely necessary stripping off of his old clothes by Gem and her colleagues.
Shout Out: To Obi-Wan Kenobi in Star Wars with the beard, cloak, hideout, hermit nature, and regret.
Alan Bradley (Bruce Boxleitner)
Coming back from the original TRON, Alan Bradley is revealed to be one of Kevin Flynn's closest friends and still in the employ of ENCOM. According to the ENCOM website, Alan holds the position of Executive Consultant, and later promoted to Chairman of the Board by Sam. He was the man who sent Sam to Flynn's Arcade to investigate a message, starting the search again...
The Mentor: Arguably, since he became Sam's surrogate father during Kevin's disappearance.
The Peter Principle: According to supporting materials including the Alternate Reality Game, he was made CEO of Encom after Kevin's disappearance, and was later forced to resign as a result of the company's decline in the late 80's. Consider that he's a computer programmer, not necessarily a businessman by trade.
Promotion to Parent: Acted as a father figure to Sam Flynn after Kevin's disappearance.
She's Got Legs: To reiterate, there's the scene midway through during the explanation of how Kevin got stuck on the Grid...whenever it cuts to Quorra we inexplicably get a full shot that does nothing but emphasize this.
The Corrupter: Since he can't create programs, he gets new recruits for his armies by "rectifying" them and removing their free will. He even manages to corrupt Tron, now known as Rinzler.
Creative Sterility: Cannot make new programs, so he must enslave them instead.
Legacy Character: The original Clu was destroyed by the MCP in the original film. This Clu is an upgraded version that Flynn created to help him supervise the Grid.
Name's the Same: People forget that this is not the same Clu from the first movie but a separate program with a completely different function who is named after Flynn's hacking program from the first movie. This hasn't stopped anyone (even in this very article!) from referring to the two of them as if they were one in the same.
Visionary Villain: Wants to create the perfect system... because that was the first order Kevin Flynn gave him upon his creation.
Villainous Breakdown: Experiences this twice; first when he's searching Flynn's house, and the second when his creator tells him that perfection is impossible.
Rinzler/Tron (Anis Cheurfa, voiced by Bruce Boxleitner)
Badass: This should be empasized, short of Clu; Rinzler is the most fearsome thing on the Grid bar none.
Note that during the flashback as Tron, he was able to take out four of Clu's elite Black Guards in roughly the span of 2 minutes without breaking a sweat or even remotely having to strain himself. Compare anyone else who has to tangle with the guards or even some of the higher level sentries, which usually results in a quick derezzing.
Bifurcated Weapon: complete with a hilarious jab from Sam, "oh come on is that even legal?"
Lightning Bruiser: Unlike Clu, who just simply shrugs off hits, Rinzler artfully dodges out of the way. And then is on you a heartbeat later, going ginsu on you with his dualdiscs.
