Symbiat

Symbiats are a class for Spheres of Power. Fluffwise, they're people who've had aberrations stuffed into their heads in a horribly painful process, making them a sort of half-Illithid with more psionics and less tentacle. Mechanically, they're Spheres' answer to the Psychic Warrior and its derivatives, with some Monk and Rogue thrown in. Their class abilities give them a bit of defensive ability and a lot of team-buffing powers, like marking targets and general boosts to attack, damage and AC. They're also a Mid-Caster, they get Mind and Telekinesis spheres for free, and they've got a medium BAB progression, making them a decent Gish when they're not managing aura effects.

Symbiats are probably around Tier 2. It's hard to truly screw up your build when playing one, because even if you do silly things with your Sphere talents, the class abilities give you a sweet buffing toolkit that every team is going to want.

The Classes of Pathfinder 1st Edition
Core Classes:	Barbarian - Bard - Cleric - Druid - Fighter - Monk Paladin - Ranger - Rogue - Sorcerer - Wizard
Advanced Player's Guide:	Alchemist - Antipaladin - Cavalier Inquisitor - Oracle - Summoner - Witch
Advanced Class Guide:	Arcanist - Bloodrager - Brawler - Hunter - Investigator Shaman - Skald - Slayer - Swashbuckler - Warpriest
Occult Adventures:	Kineticist - Medium - Mesmerist Occultist - Psychic - Spiritualist
Ultimate X:	Gunslinger - Magus - Ninja - Samurai - Shifter - Vigilante

The Third Party Classes of Pathfinder
Psionics:	Psion - Psychic Warrior - Soulknife - Wilder Aegis - Cryptic - Dread - Marksman - Tactician - Vitalist
Path of War:	Stalker - Warder - Warlord - Harbinger - Mystic - Zealot
Akashic Mysteries:	Daevic - Eclipse - Guru - Nexus - Radiant - Rajah - Stormbound - Vizier - Zodiac
Spheres of Power:	Armorist - Elementalist - Eliciter - Fey Adept - Hedgewitch - Incanter Mageknight - Shifter - Soul Weaver - Symbiat - Thaumaturge - Wraith
Spheres of Might:	Armiger - Blacksmith - Commander - Conscript Savant - Scholar - Sentinel - Striker - Technician
Spheres of Guile:	Agent - Courser - Envoy - Mastermind - Professional
Champions of the Spheres:	Prodigy - Sage - Troubadour - Dragoon - Mountebank - Necros - Reaper Warden - Crimson Dancer
Pact Magic:	Pactmaker (formerly known as Medium)