The Old Legendary skins
Mecha Tassadar - Voice and different Spell Animations
Infested Tycus - Infested Terran theme, Odin is also indested
Queen Of Ghost Kerrigan - Different Voice, matching colored abblities like if you chose the pink tint youre spikes ultralisk are pink
Azmodunk - Different voice, and his Q has a different animation
Mecha Tyrael - same as above