- Planet Popstar from the Kirby games. Supposedly it exists within the Milky Way Galaxy as it is so far away from Earth, that it would be invisible to Earth's population. In the early 21st Century to be exact.

Drawing of the arrangement of it's rings.

Despite it's appearance as a rounded five-pointed star from space, it is a spherical Terrrestrial planet with Earthlike Conditions.
This planet is also the Home of a small pink ball-like creature with stubby arms and stubby legs, large eyes and a wears smile on his face. One of the Most powerful beings in the Universe and the savior of Popstar.
- Planet Hocotate and Koppai from the Pikmin game trilogy. Supposedly in the Milky Way too as the planet the games are set in, Called "PNF-404", is actually Earth if the manmade objects found throughout the games mean anything. The Average Hright of a Hocotatian and and a Koppaite is 2 Centimeters. Oxygen is poisonous to both races and they breath a different gas. Hocotate is known for it's lucrative freight service whole Koppai is in the grip of a planet-wide famine as a result of it's uncontrolled overpopulation.
Hocotate:
.

Koppai:
- Planet Corneria from the Star Fox games. The Capital of a space faring Civilization that encompasses the Lylat system which Corneria resides in. It is he Home planet of the Lylatian/Cornerian race. An alien species comprised of Anthropomorphic humanoid beings resembling Fauna native on Earth. There is no singular species and the classification of the Animal Kingdom applies to the countless different animal species the race is made up of. There also exist a Planet named Sauria (also known as Dinosaur planet). Home of the Saurian Race. Consisting of Sapient Dinosaur Species and other Prehistoric Animal species from Earth's past. Unlike the Cornerians, The Saurians live out a more primitive and tribalistic level of civilization, but have already made contact with Corneria as it does not adhere to a prime directive like the Federation.

Stylized portrayal of Dinosaur Planet:

Map of the Lylat System:

Both Corneria and Sauria ar Earthlike planets, but many planets in the lylat system are also habitable having been Terraformed by the Cornerian Civilization.
The Lylat System is also in the Milky Way Galaxy being near the Center of the Galaxy according to Starfox lore.
So how world the UFP and Starfleet Handle exploration of these worlds as well as possible first contact with their respective civilizations? For Popstar's case, would the Prime directive even matter at all? Especially since it's level of development is all over the place and since the Kirby Games almost always explored outer space and even planets around Popstar with and without the use of a Starship with a warp drive. How would they even handle the existence of Kirby? Especially since he's very powerful and has defeated eldritch abominations throughout the series. No way the "absolute power corrupts absolutely" shtick would even apply to him since he used his powers for good intentions and to save his home planet from universe-destroying entities.
I mean:

Even He was an incarnation of an Eldtrich being as well. Fortunately a positive/good incarnation.
How would these worlds be handled by the Federation in the following eras in the Prime universe?
- Post-ENT, DSC and Pre-TOS era
- TOS, Phase II and TOS movie era
- Post TOS, Early TNG era
- TNG/TNG Movies, DS9, and Voyager Era.
- Picard and STO era.
Lastly, How would Kevin Timeline Federation handle the discovery, exploraitons and first contact of those worlds?
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