Video game catch phrases can enhance the experience (usually, anyway).
Due to the sizable nature of the page, and the fact that it will keep growing, please try to keep them in alphabetical order by games/game series on this page so it doesn't implode.
If the phrase has become popular due to the audience repeating it, and not the characters in the show, it belongs in Memetic Mutation.
Ace Attorney: The word Objection! has been practically synonymous with the series, as all of the attorneys use it in their cases, including the easily-rattled "Rookie Killer" Winston Payne. It's even flung around outside the court room in Investigations by all the attorneys (including new ones)
Godot also has one special Catch Phrase out of the usual Objection!: "That's one of my rules."
Godot also had a tendency to say "Ha!".
Luke Atmey, Ace Detective, most notably has "Zvarri!", though he also has a recurring routine that basically goes as follows; "Now I see! It's all becoming clear! You are.... (fairly obvious statement that wouldn't require any serious amount of deductive work)! ... am I wrong?"
Of note is that Zvarri! is contagious; Maya starts using it all over the place in the case with Luke, and then once or twice in a different case.
Apollo Justice gains (in addition to Objection!, Hold it! and Take that!) Gotcha!, for when he Perceives a witness's nervous tic.
"Here comes Justice!"
In Ace Attorney Investigations, Miles Edgeworth gains Eureka! for when he figures something out using Logic.
Same game gives us Shi-Long Lang's Not so fast! which he uses where other characters use Objection!. Unlike the other charcters who have voiced phrases, he isn't a lawyer or prosecutor, but an Interpol agent.
And we shouldn't forget his "Lang Zi says" quotes.
BlazBlue: Hakumen's speech, which is sometimes shortened to even shorter variations: "I am the white void. I am the cold steel. I am the just sword. With blade in hand shall I reap the sins of this world and cleanse it in the fires of destruction. I am Hakumen. The end has come!"
Ragna has "It's not over yet!", which is even the name of one of his special attacks with which he picks up a downed enemy and socks them in the gut, and Nu-13 has "Activate Termination Protocol." [[SNK Boss You'll learn to fear that phrase]].
Borderlands: The catchphrase "Heyoooo" has gained popularity with fans. It is the catchphrase of the character Steve, a bandit, who funny enough was never even in the original release of the game. He appears a few times in trailers, promotional videos, and is refereed to from time to time in the DLC.
Cooking Mama: "Wonderful! Better than Mama!" and "Don't worry, Mama will fix it!"
The Dance Dance Revolution announcers are nothing more than entire SOUND BANKS of these. "Let's STEP STEP!", "YES! DDR!", and so on.
The more recent games combine catch phrase with a healthy dose of Large Ham. "Ready? Start stepping!/Here we go!/It's the beat!" "You are tearing it up!" "200/300/400 combos!" "Dance. All. Night~", and so on.
Dangan Ronpa has Naegi's "You got that wrong!", which he says whenever points out a contradiction during court trials.
Hinata from Super Dangan Ronpa 2 borrows Naegi's quote, and along with it he gains a new one, "I agree with that!" He says this when he agrees to someone's statement in the trials.
Disgaea 2: Adell doesn't believe in catch-phrases. They're "just not his style."
You fools! How dare you forget Rozalin! For she is the one and only daughter of Overlord Zenon!
In .hack//G.U., Haseo likes to say that he's "going to log out and check my email, or something."
In Dragon Quest VIII, Dhoulmagus ... really, Rhapthorne and, as a consequence, whoever he's currently possessing and his regular utterance of "Such a pity..."
Dynasty Warriors: Lu Bu never seems to tire seeking out someone who will provide him with a decent challenge.
Likewise, Sun Jian will never allow you to forget who the Tiger of Jiang Dong is (hint: him).
For most of the characters, there's "Enemy Officer Defeated" or "I took out an officer", though the later games give characters unique variations of this. It's also found in the Samurai Warriors and Warriors Orochi spinoffs.
Fear Effect. Glas definitely has one. It goes like this: "You draw on me? You better be prepared to face the consequences!"
Barret has a fairly long one in Final Fantasy VII: "There ain't no gettin' offa this train we're on 'til we get to the end of the line" - ironically, a line he lifted from the first heartfelt statement he heard Cloud say. Spoofed later on when multiple characters say the line in unison before Barret can.
Cloud has gotten a bit of a catch-phrase from Advent Children and Dissidia: "Not interested." Which could very well be a Shout-Out to the "no" option, which was phrased as "not interested" or "don't really care" in most of the original game's yes-or-no choices.
Sephiroth: "Good to see you, >insert Cloud or Zack<"
Sephiroth also has varients of "I bring you despair." Sometimes its reworded in the form of a question, ie, "Shall I give you despair?"
In Hyperdimension Neptunia, once Histoire regains her sprite form, she has a habit of telling Neptune and the other party members that it would take her "three days" to look up plot-important information in the tome.
Palutena: Remember when you used to say 'I'm finished!' all the time?
Pit: I... still say that. A lot.
Killer7: Iwazaru always greets the player with "Master! We're in a tight spot!", regardless of whether he has good news or bad news, and always signs off "In the name of Harman...". Likewise, Travis Bell either starts or ends his reports with a "straight up", to emphasize on his self-proclaimed honesty.
Any time you hit an opponent's weak point, the character you're using will recite their Catch Phrase.
Garcian Smith: Son of a bitch.
Dan Smith: This is too easy.
KAEDE Smith: Hurts, doesn't it?
Coyote Smith: You're FUCKED.
Con Smith: Fuck you!
MASK de Smith: Adiós (or, sometimes, "Nos vemos").
Little Busters has Riki with 'no, no, no' ('iya iya iya'), which is lampshaded in the ending sequence if you fail to get a girl's route with Masato remarking affectionately that he so loves Riki's 'no, no, no' after he says it, and 'Mission start!' and 'Battle start!' for Kyousuke, which becomes a Borrowed Catchphrase in Refrain when Riki starts a mission of his own.
''The Lost Crown': Some oft-repeated lines qualify, including: "That's very odd" and "Nothing ventured...".
Lufia2: Dekar always shows his feats off with "...it's the other thing I'm best at!"
Mario would also pick up "Let's-a go!" in multiple games. Luigi too.
Recently, Luigi has a habit of saying "okey dokey", as well as "Go Weegee!"
That last one is probably not really an Ascended Meme, since I'm pretty sure "Weegee" as a shorter form of "Luigi" was used in a Mario game before the Weegee meme existed (or at least before it was anywhere near well-known enough to be noticed by anyone who doesn't spend half their free time watching Youtube videos.)
Virtually every character with a comprehensible voice in the series will say their own name in some phrase, most frequently "(Character's Name) Time!" (e.g. "It's-a Mario Time!", "Oh yeah, Waluigi Time!", etc.)
Three words, repeated endlessly: "HI, I'M DAISY!"
And of course the famous "Our princess is in another castle"
"Keelah" is also a convenient all-purpose interjection (as in "Keelah!" instead of "My God!"). "Bosh'tet" seems to be the quarian equivalent to "You suck." (although it apparently means "faulty equipment").
In the first game, Shepard used to quip "Hit me, Joker", whenever his/her helmsman contacted him/her with some bad news and some REALLY bad news. S/He seems to have dropped that habit completely in the sequel, though.
Garrus grows fond of "Just like old times," as he and Tali are the only two full-time squaddies throughout the whole trilogy. Shepard borrows it during their last conversation in 3.
MechQuest: Mysterious Johnsson always managed to find a way to inhibit the word "mysterious" into nearly every sentence he said. Moreover, he masterfully managed to make most of his mentions be made from the miniscule "M".
Metal Gear: Solid Snake's catchphrase, "Kept you waiting, huh?", was actually a fourth-wall-breaking observation about the length of the preceding cutscene in its original use (according to the script). It stuck, to the point where the series has lampshaded its use more than it's actually used it straight, characters mocking his identical father's punctuality, and, in the most obvious example, a character in Metal Gear Solid 4 commenting on Snake's absence from an event he would have liked to attend - "he always keeps people waiting").
Otakon: "Snake? SNAAAAAAAAKE!"
Revolver Ocelot's "You're pretty good!" This proves to be one of the most subtle and poignant expressions of his character in the series; it's one of the first things said to him by Big Boss, to whom Ocelot developed an obsessive devotion that motivates more or less the entire plot. It's also his last words before his death.
Metal Wolf Chaos: The President of the United States almost speaks only in catch phrases. However his signature catch phrases are "RICHARD!!" and "HOW DO YOU LIKE ME NOW!?"
You're forgetting his real catch phrase. "Mr. President, why did you hammerthrow that tank into the Atlantic Ocean?" "BECAUSE I'M THE PRESIDENT OF THESE GREAT UNITED STATES OF AMERICA!" "Mr. President, why are you going to jump across the Grand Canyon?!" "BECAUSE I'M THE PRESIDENT OF THESE GREAT UNITED STATES OF AMERICA!" "Mr. President, why did you [insert action here]?" "BECAUSE I'M THE PRESIDENT OF THESE GREAT UNITED STATES OF AMERICA!" Let's not forget some other phrases though— some like, "The gentleman in me goes off the clock at 5 P.M.", " You'd never make it on Broadway," and " SUCK! ON MY! MISSILE PUNCH!"
"BELIEVE YOUR JUSTICE!"
From Metroid Fusion and Other M, we have the immortal line from Adam Malkovitch: "Any objections, Lady?"
Almost every character in Mortal Kombat 9 has at least two of them, one they say when a match starts (referred to as a "Battle Cry") and one they say upon winning the match. (The characters who do not are the ones who don't talk much, brutes like Goro; they only grunt, growl, or roar at those times.) Some characters have dditonal Catch Phrases that they say other times, like when performing an X-Ray Move or Fatality.
MOTHER 3: "Tonda Gossa!" from the fictional band DCMC.
The Next Big Thing (A.K.A. Hollywood Monsters 2 in some territories): Both main characters have their own "reverse catchphrase" in which the catchphrase is not said by them, but as a reaction said by the character you are talking to.
Liz Allaire: *Says something ridiculous or completely crazy*
Person/Creature/Robot she's talking to: "Disconcerting." / "That's disconcertingly _____."
Dan: *Mercilessly insults the person he's talking to.*
Old friend/Main Villain/Security Robot/Hot Bimbo: "Haha. What a dude."
Resident Evil 4's Merchant has many, notably calling Leon "stranger", "whattaya boiyin'", and "heh heh heh, thank yew."
River City Ransom: Kunio's catch-phrase in most of the games is "Namen'nayo kono yarou!" ("Don't mess with me, punk!"), often shortened to simply "Namen'nayo!". Ironically, this was originally said by Riki (Kunio's rival and later friend) in the original Kunio-kun''.
Whenever an enemy gets knocked out, they'll usually let out a loud "BARF!" or some variant, depending on their gang affiliation.
Sega Saturn: Segata Sanshiro has these words implanted in your head after he kicks your ass: "Sega Saturn shiro!!" (You must play Sega Saturn!!). It's also his Famous Last Words.
In Silent Hill 4, Henry commonly reacts to the game's bizarre goings-on with a poignant "What the hell?"
And, of course, Harry's infamous and constant, "Have you seen a little girl?"
SNK fighters such as Fatal Fury and The King of Fighters have casts of characters that each have at least 2 or 3 of their own catchphrases, often used as pre- or mid-battle taunts, or victory cries. The most famous is by far Terry Bogard, whose entire list of vocal lines is pretty much a list of Engrish catchphrases in themselves. For the sake of simplicity, here's the big three SNK heroes lines:
Kyo: Ore no...kachi da! (This is...my victory!) (rendered as "I am...the champion!" in Maximum Impact's dub, which actually makes sense, given the wording order of the Japanese phrase.)
Ryo: Osu! (A standard martial arts saying)
Terry: OKAY! (Usually accompanied by him tossing his cap. In Mark of the Wolves and the later KOF games he tosses his bomber jacket and catches it)
Again, from SNK... by KimKaphwan... Aku wa yurusan! (Evil is unforgivable!). Sure enough, his associate Jae Hoon follows the suit.
S.T.A.L.K.E.R.: Shadow of Chernobyl has a number of repeated phrases, some earning Memetic Mutation. These must at all times be imitated with gratuitous Russian accents.
Duty Guard: "Get out of here, Stalker!"
Bar Bouncer: "I said come in, don't just stand there!"
Sidorovich: "Good hunting, Stalker."
Bartender: "Hey, Marked One. Still alive? That's great."
Doctor Sakharov: "Khello? Khello?"
General Voronin: "What are you, deaf? What [sic] are you here?"
The Adjutant in StarCraft frequently utters "Receiving incoming transmission" during the campaigns. And let's not forget any Protoss character's "En Taro Adun!"...
Some more catchphrases: "You want a piece of me, boy?" "Just gimme something to shoot!" "Proooo-ceedin'." "My life for Aiur!" "For Overmind." "Battle cruiser opereshonal." "Explorer reporting." "Ahh, yeah, that's the stuff!" "Orders, captain?" "I can't build there, there's something's in the way." "You Require More Vespene Gas." " "You must Construct Additional Pylons." "SPAWN MORE OVERLORDS!"
Star Wars: Knights of the Old Republic Atton of the sequel has, "Pure Pazzak!", a reference to the blackjack-like game he plays obsessively. From the same game, the battle droid HK-47 has his distinctive expression of "meatbags."
And Atton sometimes uses the aforementioned "I have a bad feeling about this," and it is even mentioned as one of his special abilities (which is of course never referenced again). Kriea uses "...Listen!" so much it might count as hers.
Tales of Symphonia: Dawn of the New World will leave you with nothing in your head but "Courage is the magic that turns dreams into reality." This isn't a character catch-phrase (in the timeframe of the game itself, anyhow); this is the game's catchphrase.
In the Japanese version of Time Gal, Reika says "Sore!" ("There!" in Japanese) a lot.
TimeSplitters has Cortez proclaim "It's time to split!" whenever he is about to time-travel. By the third game, everybody is so dulled by his catchphrase and grand delivery that he starts cutting it short.
There's also the villain, Jacob Crowe, who's catchphrase is "See you in the future, sucker!" and the R-110's catchphrase is "Eat my lazer! Eat it!", which changes to "Eat my primitive projectile! Eat it!" after being sent back to the 1920's.
Touhou has several, but as usual, the fandom exaggerates. Many of them only appear once in canon.
First is Rumia's "Is that so~?", intoned in a happy voice. It also appears in many variations and puns in fanworks.
Second is Cirno's "Eye'm the strongest!".
And third... are the yukkuris, disembodied heads that take every opportunity to appear suddenly and yell at the cast to "TAKE IT EASY!". There are a few more, but as a fan-driven phenomenon, it's hard to get authors to agree on many of them.
Utawarerumono: Touka generally says 'What have I done?!' whenever she messes up. She happens to be a major genius ditz and what we mostly see is the ditz so she ends up saying this a lot. Oboro even notes her clumsiness.... Unfortunately, she's a lot stronger than he is.
As well as such gems as "Zetta" (as in "Zetta slow!" or "You're soooo zetta slow!"), as well as a vocalized "SOHCAHTOA" (a mnemonic device for basic trigonometric functions) along with a textual convoluted statement that fits the acronym.