Brook is a prominent member of the Straw Hat Pirates in the anime One Piece. He joined the crew during the Thriller Bark arc because of his unique abilities, and he has been a loyal member ever since. Brook possesses the power of the Yomi Yomi no mi devil fruit, which grants him the ability to come back to life after death. He is also a skilled swordsman and musician. However, his Achilles heel is the seastone, which neutralizes the abilities of devil fruit users.
Many fans have wondered what would happen if Brook were to be restrained by seastone handcuffs. Would he die, or would he survive? The answer is simple: Brook would not die, but he would become weak. Since his ability to leave his body and wander as a spirit is negated by the seastone, he would be unable to use this power. However, his power of immortality would remain unchanged because he has already used it to revive himself.
Brook’s weakness towards seastone causes him to be cautious while traveling in the sea. If he were to be restrained and thrown into the water, he would have a difficult time breathing and ultimately die. However, as long as he is only restrained by seastone, he is still capable of defeating his enemies with his swordsmanship and musical talents.
In conclusion, Brook is an essential member of the Straw Hat Pirates, and his power of immortality has proven to be advantageous many times. Although seastone is his weakness, it is still no match for his skills and perseverance. Regardless of his setbacks, Brook remains a vital member of the crew and a fan favorite character in the One Piece anime.