Inspired by the famous merchant brigantine, Mary Celeste, Strength is a Stand bound to a small yacht, which is then transformed by the Stand into a gigantic freighter named "Big Daddy". As a massive ocean liner, it is the largest Stand ever seen. It has absolutely no will since Forever has absolute control over it. It represents the Tarot Card Strength, which symbolizes a challenge to fight, strong will and hidden potential.
It remains the largest corporeal Stand ever featured, occupying the space of a freighter.
Control: Strength is capable of binding itself to an inanimate object and bringing out its true potential. When bound to a ruined yacht, Forever was able to transform it into a gigantic freighter. It is possible that Strength can have this effect on any vehicle or even any inanimate object. While Strength is bound to an object, Forever gets unquestionable psychic control over it. Even objects such as electrical chords, bolts in the hull, and the very floors and walls themselves are bent and twisted to the beck and call of Forever. This power can be used to surprise attack those who board the yacht and also allows Forever to travel through the ship's walls and floor as if they were liquid.
- Strength's concept was inspired by the real-life ship Mary Celeste, which was famously found adrift and mysteriously abandoned in the Atlantic Ocean.
- In appearance, Strength resembles the possessed killer freighter from the 1980 horror movie Death Ship. In the OVA, many shots of Strength's interior and machinery also are similar to the ones seen in the movie.