Captain of the Red-Hair Pirates, and one of the Four Emperors, a group that is one of the world’s three major powers. He dislikes unnecessary conflict and is greatly respected, even by the Marines. Also known as “Red-Haired Shanks.”
Increases chances of getting PSY slots and boosts PSY characters’ ATK. The higher HP is before attacking, the greater the ATK boost The exact multiplier used to compute the damage is proportional to the crew's remaining HP and is higher the higher the HP is. The multiplier is calculated as 2 + 0.75 * (remaining HP) / (total HP). At full health the boost is equal to 2.75x, with 1 HP left to 2x.
SW Shanks has a reputation as one of the weaker legends. Still, he is undisputably good for clearing almost anything with an INT boss.
It is estimated that a single SW Shanks will roughly double the chance of matching orbs (from 18% to 34%) and consequently slightly lower tha chances of bad orbs (from 16% to 13%). Another estimate for Double SW Shanks, with lv 3 matching orbs (a 7% increase in itself), plus Red Force ship, should give you a slightly over 80% chance of PSY orbs. As a rule of thumb, one Shanks should give you ~2 PSY orbs, and double Shanks, ~4-5.