* The titular character from ''BillyHatcherAndTheGiantEgg'' has some qualities of this, fitting his role as savior of Morning Land.
* In ''VideoGame/DissidiaFinalFantasy'', Tidus (VideoGame/FinalFantasyX) feels like this. But it's a different play on this trope -- he is not overly upbeat, but when you put him with the rest of the game's cast, he is a damn good machine of mood-lightening...unless you bring up his Father, in which case he becomes a Ball of Angry Angst. Zidane (VideoGame/FinalFantasyIX) counts as well, though he can occasionally [[LetsGetDangerous get serious]], and Bartz (VideoGame/FinalFantasyV) rounds out the trifecta of cheerful FF heroes in the 13th Cycle. And let's not forget Vaan (VideoGame/FinalFantasyXII), who [[WhatCouldHaveBeen would have been a fourth]].
** In the sequel (which does include Vaan), he ends up being pretty laid back about things, along with Laguna. When he's in battle, however, he's extremely loud, self-confident, and boisterous.
* Parry Gotha in ''VideoGame/DragonQuestV'', mostly as the effect of the party talk system. He even think of his uber legendary sword as a ''toy''.
* YesMan of ''VideoGame/FalloutNewVegas''.
* Zack Fair, the thoroughly {{Adorkable}} protagonist in the ''VideoGame/FinalFantasyVII'' prequel ''VideoGame/CrisisCore'', is enthusiastic, bouncy, and friendly to the point that people start sticking him with the nickname "puppy".
* Snow Villiers from ''VideoGame/FinalFantasyXIII'' is not a little boy at all -- in fact, he's a positively huge rough-and-tumble looking guy -- but he's got the personality pretty much down pat.
* Kieran and Tormod of ''FireEmblem'' qualify.
** In fact, Kieran is so crazy, he'd qualify for [[GenkiGirl Genki]] '''[[UpToEleven GUY]]'''.
** ''[[VideoGame/FireEmblemAwakening Awakening]]'''s Henry is a rather twisted example, as while he is unendingly upbeat and never seen without a smile on his face, he also happens to be a [[CastingAShadow dark mage]] who has [[NightmareFetishist a thing for blood]] [[BloodKnight and murder]].
* ''InazumaEleven'', [[TheHero Endou Mamoru]] is probably the happiest of the major heroes in the Raimon Academy and Inazuma Japan National. His happy trait and HeroicSpirit are what drive the team to victory. Moreover, he almost never angst after the first game.
* ''VideoGame/KidIcarus'': Surprisingly, Pit, to the point that even when the game gets dark and serious, he's incredibly difficult to take seriously.
* Sora, of the ''KingdomHearts'' series can be relentlessly cheerful. He pretty much has to be to be able to keep up with a pair of classic {{Toon}}s as his sidekicks.
** Ventus is just as adorable and cheerful as Sora, but in less of a "hyperactive puppy" kind of way and more of a down-to-earth, gently smiling fashion.
* CloudCuckooLander Ellis from ''VideoGame/Left4Dead2'' is a Keet, though a toned-down, Southern version.
** Arguably ''Louis'' from the original ''VideoGame/Left4Dead'' is another, perpetually optimistic flavor of keet, always hopeful, trying to keep the team's spirits up and looking at the bright side of things in the middle of a ZombieApocalypse.
* Conrad Verner from ''Franchise/MassEffect'', a hyperactive, hyperenthusiastic {{Fanboy}} who keeps trying to impress Shepard. If you're not careful in dealing with him, [[spoiler:his enthusiasm can get him killed.]]
* Claus from ''VideoGame/{{Mother 3}}''. [[spoiler: For the single chapter he's alive, that is.]]
* Teddie from ''VideoGame/{{Persona 4}}''. Tiny, loud, hyper, cheerful and the instigator of most of the homosexual things in the game.
* More so then his anime counterpart, Barry/Pearl/Damion from ''{{Pokemon}}'' Diamond, Pearl, and Platinum.
* Griff Simmons from the ''SSX'' Series fits well into this.
* ''SonicTheHedgehog'': Charmy Bee fits perfectly into this trope, as he is often energetic, playful, and very scatterbrained. Of course, his constant buzzing can be annoying sometimes.
* ''SuperMarioBros'': Mario definitely fits as one of these, with his cheerful [=YAHOOs=] and [=WAHAHAHAs=].
* Mao from ''VideoGame/{{Tales of Rebirth}}'' is an AdorablyPrecociousChild who seems to be always ready to lighten up the mood.
* [[MotorMouth Fast talkin']], [[BatterUp skull bashin']], [[CaffeineBulletTime cola swillin']] Scout, from ''VideoGame/TeamFortress2''. Short, shrill, and hyper to the point of infuriating? You betta believe it pal! Obviously, he is also ''far'' more violent than most {{Keet}}s -- a trait that gets lost when he's subjected to {{Wimpification}}, as he frequently is.
* In most of his incarnations, Link is a rather serious young person. By contrast, ''VideoGame/TheLegendOfZeldaTheWindWaker's'' Link is cheerful, upbeat, and downright silly at times. He can still go toe to toe with the baddest of the bad, but he was also once turned into a human pancake.
* Cadet Ellis (no relation to [[VideoGame/Left4Dead the Ellis above]]) from ''{{Vindictus}}''. [[spoiler:Makes it all the more of a PlayerPunch when he eagerly runs off to prove himself and gets brutally killed by a giant goblin.]]
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