With Great Power Comes Great Insanity: Political power, but it still counts. As he settles more into his role as leader, his sanity slips further and further away until he decides to rig Kickassia with 20 tonnes of dynamite.
Split Personality: Debatable. But he seems surprisingly sincere at the end when (under the Fritz Von Baugh personality) he insists that he's not the President even as the group is giving the nation back to him.
The Hero: Subverted. In the videos he made following Kickassia, he portrays himself as one; calling himself "the liberator of Kickassia". Two things should be noted, however: first that a Selective Memory is totally in-character for Linkara, and second, that while technically he helped liberate Kickassia from the Critic, he was still part of a group that invaded Molossia for no reason and took it over from its rightful ruler.
Large Ham: He is virtually a Straight Man through most of the story, aside from MarzGurl's near death and when he plays Patton. Then he becomes hammy with a side of ham. (Now with extra ham).
Only Sane Man: When it comes to the unleashing of Insano at least. He's the only one who objects to what is obviously a doomed plan. Granted, this is partially just because he'd rather use his own attack plan, but that doesn't make him less right.
He's also the earliest objector to the entire invasion of Kickassia, but ends up going along with it.
Near the end of part 6, he temporarily seems to abandon his sanity and tries to declare himself ruler of Kickassia.
Genre Savvy: Within seconds of being presented with all the worries the others have about N. Bison, he asks exactly how many of them have been "talking to that Baugh guy," seeing right through Baugh's apparent plot. Subverted in that The Critic really has gone that crazy.
Hypercompetent Sidekick: He takes care of Kickassia's economy and gets really worried when it don't live up to the standards the group has. He tries to report it to the Nostalgia Critic about it but gets ignored, much to his frustration.
Non-Action Guy: Is hilariously ineffective invading Molossia, and doesn't even try to resist his arrest and banishment.
Oh Crap: When he sees how crazy Critic has become, and seconds before Film Brain springs a trap on him.
The Smart Guy/The Evil Genius: Realized the depth of the problems in Kickassia's government as early as Part 3 and was the only one really trying to do something about it. When he returns from banishment in part 6, he makes sure to take care of the Critic's dynamite first, rather than just rushing in and hoping to be able to kill or disable Critic before he can use it like everyone else.
Smug Snake: It's not really played up, but it's there.
Those with brains usually have power over the brainless.
That line in particular also doubles as a Stealth Insult, since most of the cast didn't seem to realize that he meant them.
Brick Joke: The reason he deduced that while holding an Uzi, one will not die, apart from Insane Troll Logic, is that in the previous chapter, he survived one of President Baugh's cannon blasts just by ducking while holding an Uzi.
Mythology Gag: Given the kind of fanfics he reviews, is it any wonder he came out with it?
The outtakes have plenty more suggestions like that, including the surprisingly simple I say we kill him.
Insane Troll Logic: Apparently, when holding an Uzi, you will not die. Although granted, Sage probably can't find any other explanation for why he is alive after a near miss from President Baugh's cannon.
Juggling Loaded Guns: Uses the barrel of his Uzi to wipe away a tear during Cinema Snob's banishment.
Hilarious Outtakes: Including a bit where he ad-libs how the Kickassian government will make its money from pimping out Benzaie in Vegas.
Real Life Writes the Plot: It was originally planned for him to have a much larger role, but the commentaries revealed that his part was trimmed down to almost nothing due to his injuries during the first day of shooting.
Straight Man: From what little we see and commentary hints, he was possibly going to be one of the straightest characters. For example, while most of the cast was struggling with and climbing over the Insurmountable Waist High Fence, Lord Kat was simply going to take two steps over and go through the gate.