The Mage is a Psionic Class that levels up like a normal soldier. It won't suit everyones game so keep that in mind.

Loadout:
Assault Rifle
Psi Amp

Squaddie:
Insanity

Corporal:
Stasis
Inspire
Soulfire

Sergeant:
Stasis Shield
Schism
Soul Steal

Lieutenant:
Restore (Heal an ally for 6 health and fully restore their condition)
Domination
Malaise (Create a cloud of poison and misery at a location)

Captain:
Sustain
Voidrift
Fuse

Major:
Solace
Disable (Disable enemy weapons in a large AoE, can also stun them)
Fortress

Colonel:
Barrier (create a psionic shield around nearby allies granting them shielding)
Teleport (Warp to any location within squadisght once per turn, free action)
Nulllance

GTS:
Hidden Potential (+25 psi offense)