Toodles, the Multi-Planet Conquerer
Living only on Venus just wasn't cool enough for him.
Because of Mercury's highly visually reflective surface, Toodles has a pair of dark, translucent eyelids covering each of his eyes - you might say they're shades. These help keep him from going blind while traversing Mercury's almost mirror-like landscape.
Because Venus has very, very extreme heat almost everywhere on its surface, Toodles needed a way to get out of it. This is why he is capable of seeing infrared waves. He's able to find cooler areas simply by looking at them, allowing him to seek shelter in a cave or practically any of the few places that cooler temperatures exist.
Since Mars has a sandy, dusty surface almost everywhere on it, Toodles has developed sharp digging claws on his limbs to allow him to dig holes on the Martian surface. This way, he can bury himself, both to hide from humans and to seek out a cool shelter when it happens to be too hot.
Since Jupiter is mostly or entirely gaseous, the legs that Toodles has are almost useless there. That's why Toodles also has wings that allow him to soar through the skies of Jupiter, even if he can't find a place to land.
Saturn has a ring system with many small rocks and minerals in it, of which many likely fall down to Saturn's atmosphere. This is lucky for Toodles because he happens to eat and live off of these small mineral particles. While he can do this on other planets, it helps him to survive most on Saturn.
Because it's dark on Uranus more often than it is on most other planets, Toodles has very advanced eyes that allow him to see much more light than our puny human eyes do. They can differentiate even a few photons of light even at great distances, keeping his world illuminated on Uranus, where the Sun don't shine.
The gases that Toodles stores in his body for Jupiter can also be used - when oxygen is present - for combustion and the production of fire and heat. This, along with his compass, helps him stay warm on Neptune.
Dwarf Planet: Pluto
Pluto is known for having a moon with a similar size to itself, Charon. These two objects actually orbit each other, in almost a double-planet way. They're so near each other and similar in size, and their gravitational pulls on Toodles are so weak, that Toodles has grown really, really strong legs that allow him to propel himself from Pluto onto Charon and back if he desires. This way, if a threat exists on Pluto, he can retreat to Charon, where it is likely more safe.
Though Toodles breathes carbon dioxide as air, he cannot breathe it straight out of a liquid. This is why he has a set of gill-like organs that separate the carbon dioxide in air form from the fluids in the comet, allowing him to filter only the stuff he needs to live from the liquid, and allowing him to breathe normally.