Imposter Forgot One Detail: More like every detail. Shapur fails at imitating Kaito because his personality is pretty much an exact opposite.
Instant Expert: Though Shapur moves like an amateur early on, he learns the dance style and routine of Team Baron with surprising ease (or at least manages to improvise something similar that somewhat resembles the rest of the team's moves and looks fairly competent).
Keet: This is part of the reason no-one buys Shapur's Prince and Pauper act with Kaito.
Knight of Cerebus: While Gaim is already a very grim and serious show, Alfred's scenes in the Baron special are the ones that take a sharp turn from what began as a mostly lighthearted, comedic story (albeit, with mentions of grim subjects like parental abuse and suicide) into more serious matters like treason and attempted murder.
Let's Get Dangerous!: When Kaito resists being taken by his men after they mistake him for Shapur, Alfred decides that they're not playing nice anymore and stops trying to hide his true nature, starting with having Kaito incapacitated by tasers.
The Starscream: Despite the lack of spoiler tags to Alfred's treachery, the plan to murder Shapur actually originally comes from his father. What actually makes him apply for this trope is that after talking to Ryoma and given the Driver and Lockseed, he decides to kill Shapur's father as well and take over the foundation.
Unwitting Pawn: It's really apparent that Ryoma gave Alfred the Dragon Fruits Energy Lockseed simply to use him as a guinea pig.
You Have Outlived Your Usefulness: It turns out, Shapur is no longer actually the heir. He was merely adopted to be one, until his father had a natural-born son. And he's aware that he's been considered expendable. He just didn't realize that it's to the point of wanting him killed.
Offing the Offspring: Unbeknownst to him, Shapur has been marked for death by his own father, who no longer needs an adopted son now that he has a natural-born heir.
