Buki: Claws from the Shadow Realm (when you give the ferry man the spirit orbs). First upgraded armour and 1st spirit strike.
Ailish: 2 spirit strikes, 2nd upgraded armour and a staff that shoot fireballs.
Tal: Sword of Hukins Fate, 1st upgraded armour and 1st spirit strike.
Elco: Debilitator gun, no armour upgrade, no spirit strike.