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Nessa from Fractale, who "loves love and hates hate."
Love Momozono from Fresh Pretty Cure!. She's born with her Multi-Ethnic Name from her parents (but mainly her grandpa) so she's able to spread love and happiness to everyone, and she took that thing at heart. She's extremely friendly, her Catch Phrase is "Get your happiness!", attempts to make her friend happy going south (at first) is enough to make her bawl, and if able, she's also reaching out for some of her enemies to reach their own happiness. It works on Eas, culminating her Heel-Face Turn into Setsuna/Cure Passion, and she even attempts that on the Big Bad Moebius to reach his happiness, which backfires when Moebius declared that his happiness is the destruction of the Pretty Cure, even at cost of his destruction. The Cures survive the attempt, though.
Rentaro from Black Bullet falls into this. This is a deconstructed trope, as he wants everyone he loves and cares about to be happy, at the expense of his own happiness. The reason he withhold the crucial information about the sad eventual fate of cursed children becoming Gastrea monsters to Enju Aihara, a cursed child and Initiator who happens to have 500 days to live as a human (or the fact that Enju is slowly dying), is because he wants Enju to live a happy life in her remaining time as a human. It bites him in the ass during volumes 5 and 6 where he was arrested for a crime he didn't commit. Rentaro told Kisara that he is willing to sacrifice his own happiness and freedom for the sake of Kisara being happy. Needless to say, Kisara broke down in tears simply because Rentaro isn't happy.
The titular character from Puella Magi Madoka Magica. Apparently, her selfless dedication to make other happy causes her to pull a Heroic Sacrifice at the end involving removing all despair from witches across time at the expense of erasing her own existence.
This is deconstructed in Fruits Basket, teaches that a person should strive to make others happy but accept that it's fine to occasionally be selfish in certain regards. Tohru has difficulty with this initially and tries to be so utterly selfless that she does things that are detrimental to her health (avoids discussing her problems with others because she doesn't want to upset them, living in a tent in the woods and getting sick because her grandfather's house was being remodeled and she didn't want to inconvenience her friends, etc).
In Anatolia Story, Kail wants to become the next king so he can ensure the wellfare and happiness of his subjects. The fact that Yuri always worries about wellbeing of the people she meets, no matter what their social status or situation, leads to him realizing that she might just have the qualities necessary to be the most powerful woman in the entire empire. This inevitably leads to both of them being favored as the new rulers, over the evil queen Nakia.
In Prime Baby, the sluglike aliens turn out to be "missionaries of smiles and happy feelings". They hold sing-alongs and knit socks for the homeless.
In the Star Wars Expanded Universe, the Zeltron hat is this... mostly. Justified as they're a race of empaths. If someone's unhappy, the whole block knows it and can feel it. The sociopaths of their species usually travel off-world to get away from the good cheer.
Erwin and Hange even have this as their stated goal: they want to maximize happiness for humanity.
Amélie, who decides her destiny is to bring happiness and beauty to the lives of others - though she's not above cheating, fabricating, or deceiving to do so.
In Happy-Go-Lucky, Poppy just wants to share the joy and that everyone is happy. That goes so far as trying to cheer up even the grumpiest of people she meets.
Giselle in Enchanted pretty much acts on this as her life philosophy, up to and including impromptu (delightful) musical numbers.
Johnny Appleseed was famous for this. Though he spent most of his life a simple hermit, he made it his mission to cover the United States territories with apple trees so that everyone could enjoy their flowers and fruit. That and get drunk. Apple cider (what he was best remembered for giving to people) ferments very quickly.
Kushiel's Mercy has Ptolmey Solon, the world's probably smartest man, who holds that happiness is the highest form of wisdom.
Vianne from the novel Chocolat doesn't believe in God or sin or forgiveness. She believes that "The only important thing is to be happy" - and does her best to make it happen with amazing gourmet and possibly magical chocolates. Solid strategy.
Wicked Lovely has the Summer court, who are described as 'happy by nature' and 'frivoulous and passoionate'. They oftentimes tell others to 'choose happiness'. However, due to their nature as part of The Fair Folk, they often put happiness before things like morality and loyalty, on one occaision telling Seth to leave Aislinn because he'll be happier that way.
"Sometimes it's not about being happy, but courting happiness." -Siobahn.
In Animorphs, the Pemalites fit this trope to a T. Created by The Ellimist to spread life, love and freedom, they did exactly that... until Crayak's pet creation, the Howlers, straight-up slaughtered their asses. It's worth noting that the Howlers are also like this, Crayak just gave them a warped sense of what people find fun.
Star Trek: Voyager: As the self-appointed "Morale Officer", the character Neelix is constantly trying to live up to this trope. The rest of the crew mostly just found it annoying, and Tuvok in particular once used a holodeck simulation to check if he was losing his ability to suppress his urge to kill him (he had).
In Kamen Rider Double, Shotaro Hidari makes it his mission to make sure no one in Futo cries. The fastest way to set him off is to make sombody cry in his presence.
Gentaro Kisaragi, aka Kamen Rider Fourze, also strives to protect the smiles of his friends. And his goal is to befriend everyone he meets.
Lampshaded when Shotaro and Gentaro meet in Movie War Megamax. Shotaro is unimpressed that the new Rider is a loudmouth teenager with a pompadour...until Gentaro says he's going to punish the people who made his friends cry.
In the Doctor Who serial The War Machines, the bartender asks Polly to help cheer up Ben. Polly comments on how reliably she is called on for such measures.
Bones; Brennan found herself bemused at Angela's efforts to raise money to save a baby pig from the slaughterhouse, but finally donated to her cause. Sweets commented at one point, "Sometimes you don't save the world, Dr. Brennan. Sometimes you just make your friend happy."
In the Dungeons & Dragons setting Scarred Lands, the titan Gulaben held the powers of granting happiness. The mortal peoples believed her to be For Happiness, and her popularity made her a threat to the Gods' reign over the world. Claiming that her power was merely a sinister kind of Getting Smilies Painted on Your Soul, the Gods captured her and destroyed all memories of her so that no one would try to set her free. The official truth is that she was a fickle and cruel titan, who might kill you even as she induces pleasure beyond imagination. The gods simply did what they had to do. And since we no longer remember the real truth about Gulaben, we'll just have to take their word for it.
This, hand-in-hand with Doing It for the Art, is what motivates Willy Wonka in the 2013 stage musical Charlie and the Chocolate Factory. The Impossibly Delicious Food his factory produces, as well as the strange, beautiful factory itself, all stems from his desire to make the world a happier, more colorful place by making all the things his wild imagination dreams up manifest. Beware, though — he is not immune to the darker side of this trope. While he encourages the Golden Ticket tour group visiting the factory to enjoy, explore, and consume its wonders, there are rules that must be obeyed and things that must not be touched, and the four bratty kids learn that his world has a way of dealing with those who would put their own selfish happiness above all else...
In No, No, Nanette, Jimmy is a rich Bible salesman who loves nothing more than to use his wealth to make people happy. He's a bit frustrated that his practical-minded wife doesn't let him give her money for spending (she sees no point in wasting money on frivolous things) and takes his adopted daughter Nanette to the family's summer cottage when he sees how depressed and stifled she feels (he even prefaces this decision by asking her what will make her happier than anything in the world, giving her money to have some fun, and singing a song, "I want to be happy, but I won't be happy, 'till I make you happy to!") This tendency of his actually leads to the main conflict of the play, as he loaned three greedy young women lots of money to help with their personal woes and then found himself being blackmailed and needing them paid off.
This is pretty much Felicia's outlook on life — pursue happiness, and try to make as many other people happy as possible along the way.
It's not entirely straw. The strip is based on a concept called a utility monster. Normally, it's more cost-effective to help poor people, so utilitarianism leads to a generally egalitarian society. However, if some being existed where its happiness went up linearly with money, it would be more cost-effect to just focus on making that one being absurdly happy.
This is a simplified explanation for the mission of the Knights Of Fandom: they just want people to be able to enjoy themselves online without having to worry about being harassed through cruel anonymous messages.
Care Bears more or less revolves around this trope.
Aang told Iroh how he'd been told to let go of his love for Katara in order to use his full power, and had refused to do so. Iroh immediately tells him he did the right thing, and that "Power and perfection are overrated".
Aang himself has something of this, as even though he does understand it is his destiny to beat the Fire Lord and restore balance to the world, he frequently puts that mission on hold in order to let himself and others have fun.
Princess Celestia seems this way, acting like a light-hearted pony who doesn't take herself too seriously and even enjoys a good laugh at her own expense. Over time, we've seen her get more serious, until it's apparent that keeping everyone safe is her main concern, and spreading cheer is what she does in her rare moments of down-time.
This ethical position is an important form of utilitarian philosophy, and has been consistently popular among moral philosophers since the Enlightenment. Jeremy Bentham and John Stuart Mill were both major developers of the theory, although "happiness" may sometimes be replaced with a more generally defined "good" or "well-being", or something else altogether like "freedom" or "beauty".
Note that there are multiple types of utilitarianism. For instance, while Bentham indicated that one should always do what increases happiness in a sort of general kind of way (called "act utilitarianism"), Mill's definition is rather more complex; most notably, he said that one should always follow the rule that, if consistently applied by everyone, would lead to maximum happiness/the greater good (called "rule utilitarianism").
Bentham also believed in "pleasure" as the ultimate good, while Mill said that it is "happiness". Modern utilitarians tend to agree on happiness rather than pleasure as the ultimate end, including most of those who agree with Bentham in being act utilitarians rather than rule (act utilitarianism is probably at least somewhat more common than rule utilitarianism).
The United States' Declaration of Independence includes "the pursuit of Happiness" as one of man's inalienable rights.
The King of Bhutan measures the prosperity and success of his nation (and, hence, his rule) in terms of Gross Domestic Happiness. While one of the world's poorest countries when measured in dollars, there are more important things in life than luxuries and the Bhutanese people are considered among the most happy ones with the life they have.
Note: He is so dedicated to this that he actually gave up power and changed the Government from an Absolute Monarchy to a Constitutional Monarchy
The people who give out "Free Hugs" on the street, at least ostensibly.
Random acts of kindness.
The Wiccan Rede translates to "If it harms none, do what you will." Of course, that means stopping to think about the potential harm of one's actions before undertaking something and taking the route that will cause the least harm and the most happiness when harm cannot be prevented.
This is really the soul of entertainment. Given, a large portion of it is made for monetary purposes, but the first person to transcribe a story couldn't have done it out of greed, and still those writing for money are outnumbered greatly by those who just hope for somebody to enjoy their tale. And even with the monetary slant, much of that ends up being cost of living. When it comes down to it, any entertainment/creative industry from music to video games has such high levels of risk/reward and employment that if you really wanted to be rich, you're better off being something like a doctor or lawyer.
Article 4 of the French "Declaration of the Rights of Man and Citizen": Liberty consists in the freedom to do everything which injures no one else; hence the exercise of the natural rights of each man has no limits except those which assure to the other members of the society the enjoyment of the same rights. These limits can only be determined by law.