MS
1. Skeleton: Ribcage --> Arms -->Upper Half Of Skeleton --> Full Skeleton
2. Humanoid: Ribcage not visible, has flesh, some clothing and a unique weapon
3. Armoured: Has armour, still no legs
EMS
4. Perfect Susanoo- Massive, tengu armour, has legs now and wings
This is for the future.
Just a brief overview of the different Susanoo stages.