* Size and Mass: Pluto is significantly smaller and less massive than the outer planets (Jupiter, Saturn, Uranus, Neptune). It's even smaller than Earth's moon!

* Composition: Pluto is primarily composed of rock and ice, unlike the gas giants which are mainly made of hydrogen and helium.

* Orbit and Inclination: Pluto's orbit is highly elliptical and inclined at a steep angle compared to the other planets. It also takes much longer to orbit the Sun.

* Classification: Pluto is classified as a dwarf planet due to its smaller size and the fact that it doesn't "clear its neighborhood" of other celestial bodies in its orbit. This means it shares its orbital space with other Kuiper Belt objects.

In essence, Pluto is much smaller, colder, and less massive than the gas giants, and its orbit is more erratic. It's a unique world, distinct from the "classic" outer planets.