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Forgetting to deal with the Vikings overrunning Europe on the other side of the Atlantic. In Urk's Alternate Universe, America was invaded by the local counterpart of the Evronians in the far past: the invaders gave the local humans advanced technology with little impact on the environment, united them in three nations and then left.The elves, trolls and preservers in ElfQuest (originally sufficiently advanced aliens and their servants) don't invade the World of Two Moons/Abode deliberately, but it's implied that tens of thousands of years after their arrival their influence has had subtle but highly beneficial effects on the planet's human society (carefully-controlled population, environmental management, acceptance of alternate beliefs and sexual orientations, female equality ).Thankfully because Namekians are peaceful by nature, they instead choose to live with Bulma at Capsule Corp, learning about Earth's culture and activities, in exchange for allowing the Z Fighters to use their Dragon Balls to wish their friends back to life. In terms of strength and abilities, the Namekians are naturally hundreds of times stronger than humans are note The few humans who were stronger than a Namekian were all dead at the time, until the Namekians used the Dragon Balls again over the next year to revive them., and the King Piccolo Saga of the original series shows that they are more than capable of doing the same thing to Earth. All of the Namekian race (sans a tribe that was murdered by Vegeta) have been brought to Earth by Dende as a last-minute wish to save them and their Dragon Balls from Frieza. The aftermath of the Frieza Saga in Dragon Ball Z is one, from a certain point of view.However, the Fibers intend to destroy all life on Earth to spread themselves through space to reach further planets, making their endgame about as far from benevolent as can be. Overall, while there are a few drawbacks, it's still a pretty good deal.
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Life Fibers are hostile alien parasites that feed on the humans that wear them, but they are the main reason humans evolved into an intelligent race, and wearing a Life Fiber outfit gives the wearer incredible powers, though in high concentrations they may also turn the wearer hostile. Most of the plots involve some of the loopy princesses who can't be bothered to take a spaceship piloting course causing minor (or major) crises because of their own personal fecklessness, while the general alien populace just sort of accepted Earth into the fold without batting an eye.
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Fortunately for us, they were apparently from The Federation, and all the aliens apparently wanted to do was take vacations here and visit our tourist traps.
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UFO Princess Valkyrie apparently had aliens land in modern-day Earth at some point.A subversion of this is the central premise of Cannon God Exaxxion, where for years the aliens posed as this but it was simply an act to get us dependent on them and allow them ease for conquering us.To them, it's just, "WHOOHOO! Free hot slave girls!" Of course, this is still all perfectly positive to the HUMANS. Truth is, they are a race who were genetically designed to be slaves, and NOT being given orders leads them to eventually freak out in uncontrollable violence. True to form, they are very nice and kind to their hosts, happy to do whatever is asked of them. The basic premise of DearS is that aliens land on Earth with entirely benevolent reasons.The invading aliens, after a period of bloody war that it's generally agreed humanity lost, mellowed out and managed to push the technology of the entire world forward a few centuries: Japan around the 19th century now has machines, skyscrapers, and Shonen Jump manga, which the ex-samurai protagonist loves to read. Gintama is arguably an example of this trope.But whoo boy, ain't it a Crapsaccharine World at best. Not to mention bringing with them extremely useful nanomachines. Basically, the Arume are a race of lesbian aliens that invaded and conquered our Earth at some point in the past, and ever since, the Earth has been relatively free of conflicts. Blue Drop deconstructs this trope to the point of being horrific.
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