Updated form of this one.
I didn't really like how Hades' design stuck out like a sore thumb against the others, so I redesigned him to have a colour scheme more reminiscent of his namesake.

Helios' team is made up of 10 (formerly 9) members; 5 nevreans, 4 sergals, and 1 avali.

All the Nevreans above, alongside Hermes, Ares, and Hades, are male, whilst Aphrodite and Gaea are the only two females in this team. Well, Gaea used to go by Oceanus and is actually trans female.

Out of these ten, Helios, Zeus, Cronus, Uranus, and Poseidon are elemental Nevreans, each with an elemental power and associated bird;
Helios: Fire, phoenix / harpy eagle
Zeus: Lightning, golden eagle
Cronus: Earth, secretary bird
Uranus: Wind, peacock
Poseidon: Water (+ice), cryophoenix
They are all, like Helios, refugees from Rain's attack on Nevrea.

The sergals, all descendants of Western sergal refugees, simply joined the team upon its formation. The markings on their foreheads are loosely based off the planet symbols of Mercury, Venus, Earth, and Mars respectively.
BTW, Aphrodite and Gaea are a pair of twins.

The newest member, Hades, is an avali who crash-landed on Tal. He ejected himself prior to the crash, so he was safe, but his spaceship was destroyed beyond repair. He was found and taken in by the team, where they adapted a freezer room to be his home on Tal.
Hades has a special suit to keep him cool on Tal, as Avalon, the Avali homeworld, is significantly colder than Tal.

Partially based off  Plaguedogs123's Planet Dragons,  ulariogryphon's Celestials, and partially based off elemental phoenixes, but since I am more a fan of Vilous than dragons, here you go! Fine, Hades is an avali, but I'm including him here as he's also meant to be part of the fanmade stuff I made for them.

I also created "next generation" characters for them, being the children of the above, and Hades' pack, who are all also named after dwarf planets.

FULL BODIES
Helios
Hermes
Aphrodite
Gaea
Theia (Oceanus's late wife)
Ares
Zeus
Cronus
Dionysius (was fired from the team after squabbling with Helios, Zeus, and Cronus)
Uranus
Poseidon
Vega (Solaris' wife and Poseidon's younger sister)

NEXT GENERATION: MOONS
Selene; daughter of Gaea
Phobos and Deimos; twin sons of Aphrodite and Ares
Io, Europa, Ganymede, and Callisto; children of Zeus
Mimas, Enceladus, Tethys, Dione, Rhea, Titan, and Iapetus; children of Cronus
Miranda, Ariel, Umbriel, Titania, and Oberon; children of Uranus
Proteus and Triton; sons of Poseidon
Phaeton, Hephaestus, Tyche, Nibiru, Nemesis, Hecate, and Boreas; children of Helios and Vega

HADES' PACK
Demetra
Hades
Charon, younger brother of Hades
Haumea
Makemake
Eris

ORCUS' PACK
Orcus
Quaoar
Gonggong
Sedna

Nevreans and Sergals by  Mick39
Avali by  RyuujinZERO