As the captain of the Rocks Pirates, Rocks D. Xebec united powerful individuals such as Charlotte Linlin, Edward Newgate, Golden Lion Shiki, and Kaido under his banner, posing a huge threat to both the World Government and other pirates.

Source: https://www.cbr.com/one-piece-characters-who-deserve-a-spin-off/

Each Xebec display slides out from behind your laptop—one on each side of your laptop’s display—thus creating a highly portable three-display work area.

Source: https://www.forbes.com/sites/forbes-personal-shopper/article/best-portable-monitors/

It is unknown what kind of abilities Xebec had, but there are several events that give the audience an idea about his strength.

Source: https://gamerant.com/strongest-members-rocks-pirates/