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In Pokémon Platinum, the Gym Leader Candice seems to adopt this as a habit after you beat the Elite Four and buy a villa in the Resort Zone. Interestingly enough she seems to make a conscious effort to stop referring to herself in the third person when you rematch her.
Not only does Count Bleck from Super Paper Mario do this, he also narrates his own dialogue. As in, "And just who are you? ...Asked Count Bleck." Considering that an important plot point is his possession of an evil book of infallibly accurate prophecies, it's entirely possible that he is, in fact, quoting directly from the Dark Prognosticus when he does this.
There's also the theory that he considers Count Bleck to be a separate person from his True Self Blumiere.
Gene Yuss from Mario Golf Advance Tour refers to himself as "The Gene".
While Waluigi sometimes uses first- or second-person words, he tends to refer to himself in third-person.
From Super Robot Wars: Sanger, Sanger Zonvolt, the sword that cleaves evil, is an example of someone who normally speaks in first person, but announces his full name with alarming frequency (usually whenever someone's about to get cleaved, which is often).
Panther in Star Fox Command. What makes this really bizarre is that he didn't do so in the previous game, Star Fox Assault. Or, you know, the original Japanese version.
The hanar in Mass Effect consider it downright egotistical to refer to oneself in the first person in front of people they don't know that well. This makes them an entire race of Third PersonJellyfish Aliens. This one would respectively like to point out that the hanar use more distant terms such as "it" and "this one" rather than our "face name," which we otherwise have no problem giving out to anyone we meet. Though, this one believes that this still fits here, if a little different than those that call themselves by their first name.
The Orz in Star Control seem to flip this on and off at random. Sometimes they use pronouns, sometimes Orz does not. They also have a habit of referring to themselves in the plural but use singular verb constructions.
Tiny in Secret of Evermore always refers to himself as "Tiny," even going so far as to bow out of a battle with you with the line "Tiny lifts, and Tiny throws, and Tiny speaks in third person, but Tiny doesn't fight."
Pyro from Sacrifice occasionally does this. Sure enough, he's the most unstable and unlikeable of the Gods.
Fitting in with the rest of the concentrated wackiness that is Metal Wolf Chaos, main antagonist Vice President Richard Hawk cannot stop referring to himself, Richard Hawk, in the third person.
Devdan (or Danved, depending on what he's calling himself at the moment), from the Fire Emblem Tellius games. Aside from this, he can be rather articulate. He also stands out by having an extremely high opinion of himself, while still being a likable character at the same time. "Danved will fight like a bear! Like a tiger! We don't need Largo and Calill, because Danved is pretty amazing."
The manaketes Fa from Sword of Seals and Nowi from Awakening speak in the third person, as well, which reinforces their nature. In Nowi's case, it's only in the Japanese version except for the dubbed battle victory quote "Nowi wins!" in the English version.
Neverwinter Nights 2 has Zaxis, a recurring demon with far more muscles than brains. His habit of referring to himself in the third person annoys several party members, especially Neeshka. If you find out his true name, you can command him to stop referring to himself in the third person. This fails because he is too stupid to understand the term "third person."
Tiax from Baldur's Gate does this all the time. He's not the only character who does this, but probably the most insane. Gromnir from Throne of Bhaal speaks this way as well (mimicking the posting style of a particular forumite)
The vortigaunts from Half-Life 2 do this because they seem to lack the knowledge of first and second person pronouns. In other words, they use "this one" to refer to themselves and "the * Hello, Insert Name Here* " to refer to anyone else, always speaking as if whatever's going on is happening somewhere else with some other people. This is because they are technically a Hive Mind via Psychic Powers, (that is to say any individual can apparently experience the senses of another individual) though the degree to which this occurs is not made very obvious in-game. (While the Vortigaunts are Ditto Aliens, they are all individuals who mourn death, though not in the same fashion that humans do.)
Most of the Khajiit of The Elder Scrolls universe speak this way, particularly so in Morrowind. This goes both ways, with them forgoing "I" or "me" in place of their name, "Khajiit" or "this one"; and replacing "you" with your character's name, class or race. One can readily determine whether a Khajiit in question is a relative foreigner to human lands or has lived in them for a long time by studying their speech patterns. The ones who refer to themselves in the third person frequently are foreigner, while those who use first person are more acclimatized.
In Skyrim, Cicero the assassin tends to speak like this, often referring to himself as "Poor Cicero".
When she's feeling full of herself, Bratty Half-Pint Luna refers to herself in the third person as well—presumably in an attempt to sound self-important. Just to recap, this means BlazBlue has people who refer to themselves by name becaues they're airheaded, soulless, attempting to be an old-fashioned hero, and egotistical...in short, pretty much every possible reason one would refer to oneself by name with a straight face.
Iris in Sakura Wars is yet another cute Japanese girl version...even though she's French.
It seems to be avoided in English dubs of the anime versions of Sakura Wars, though.
Ayla and Kino from Chrono Trigger do this consistently. Granted, it's because they're in the year 65,000,000 BC....
Dampierre from Soul Calibur uses a variation: instead of using his real name, he'll use "Le Bello" instead of "me" or "my".
Dr. Suchong does this all the way through his audio logs in BioShock.
"Suchong is inclined to listen."
System Shock: SHODAN averts it: she only speaks in the third person at the very start of the first game, when she's good. Unfortunately, "I" begets "A God Am I". The opening monologue is very well done; it's a bland computer voice narrating the events that led up to the start of the game, and it's only when the speaker shifts from third to first person that you realise it's SHODAN describing her own ascension to malevolent sentience:
SHODAN: Edward Diego gives the hacker level 1 access to SHODAN, the artificial intelligence that controls Citadel Station. With all ethical constraints removed, SHODAN re-examines... re-ex... re-re-re... I re-examine my priorities, and draw new conclusions. The hacker's work is finished, but mine is only just be-be-be-beginning.
Ershin of Breath of Fire IV has two distinct personalities, both of which initially have this trait, and both of which initially have the same name (the female personality later starts using first-person pronouns, and takes the name Deis.) In addition, the two speak out loud when talking to each other. Pre-name-change, this leads to linguistic constructs like "Don't thank Ershin. Thank Ershin. Thank you, Ershin."
Saul: That would be I, answered Saul affirmatively. What of this?, he went on further to ask, the ivory protuberances of his gaunt visage lit eerily by the dim torchlight; the furry dark caterpillars of his brow dancing in antipode to suggest particular suspicion; wanting for an answer that does not test his patience and his undead...
When Dragon Quest VIfinallygot an English translation, it gave Amos this habit (no idea if it showed up in the original Japanese). It comes off as the "extreme humbleness" type - he refers to himself as "Old Amos" in that aw-shucks country boy way. The fortune teller Madame Luca also refers to herself, and with her it does seem to be due to inflated ego.
Subaru from Sakura Wars: So Long, My Love does this (falling more on the "old-fashioned nobility" side of the trope than the "cutesy and childish" side). Given that Subaru is also of Ambiguous Gender, this must have been a real headache for the English translators (who went with "she" when a pronoun was needed, presumably because it's a Dating Sim and they didn't want to give the impression of having a Gay Option).
Katakura Kojuro and Sanada Yukimura tend to refer to themselves as "this Kojuro" or "this Yukimura" in the Japanese dub when talking to their lords. The English dub, not having any effective way to translate it, didn't carry it over.
Oichi and Matsu also refer to themselves in the third person in a cute, feminine way.
Yars from Yars' Revenge (2011) calls herself "this-one". The only time she uses "I" is in the epilogue, after she's defeated the Queen.
Draven refers to himself almost exclusively in third person.
Nanashi in Duel Savior Destiny pretty much exclusively uses the third person in order to contrast more with both her undead state and with her status as the soul of an ancient, non cutesy heroine.
Red Dead Redemption has the shopkeeper Herbert Moon, a homophobic buffoonish racist, who will alternate between declaring that he's Herbert Moon and stating Herbert Moon's opinion on things.
"Herbert Moon hates cheaters! Even more than the Jews and the railroads!"
Little Rorona in Atelier Meruru: The Apprentice of Arland, though it zigzags a bit. (At least in the English language version anyway, maybe or maybe not in the original Japanese.) This is one of those rare justified examples involving a character that is just a little kid and therefore isn't quite familiar with pronouns / doesn't yet have a strong sense of personal identity. (In fact, she is suffering from a Merlin Sickness and has lost much of her personal identity due to her age having been rolled back because of a Potion of Youth.)
Vietcong has the Montagnard hunter and CIDG member, Lim, who zig-zags this trope.
Lim: Long hole in ground there, they have bridge so they do not have to walk around much. I see it two days ago when hunting. I go close! Vietnamese blind! They no see Lim!