Alright, I'm here to offer a few possible updates of star/planet classification.
Neptune class subdivision depending on composition:
Hydrogenic neptune - Uranus/Neptune analog.
Volatile neptune - neptune forming of aquaria, whichs mass is *percentage enough to cover entire land with deep oceans*% - 25% volatiles. Examples: CoRoT-7 c, Kepler-10 b.
Supervolatile neptune - volatile neptune, whichs mass is more than 25% volatiles.
Venus-like clouds on neptunes with mass <1 M⊕ - 7M⊕
Coreless planets classes introduction:
I'd like to return the class "Selena" as one referring to a silicate planet with no core and so the magnetic field. There would also be a "Carbena" planet, a selena with carbide mantle.
Gas giant clouds on all planemos, brown dwarfs, main sequence stars, subdwarfs and white dwarfs with mass lower than the hydrogen burning limit due to their sub-stellar/planetary nature.
White holes and blue dwarfs introduction for sci-fi addons.
More white dwarf classes.