Capsule

A capsule (カプセル) is a type of device in the Mega Man franchise that is mainly used to keep a Reploid inside for maintenance or other purposes. Some teleportation devices are also shaped like capsules.

Light Capsule
The Light Capsules are capsules that Doctor Thomas Light created and hid around the world. They contain a hologram of Dr. Light and can be used to give Armor Parts or other upgrades to X.

X's capsule
The Journal of Dr. Cain mentions that Dr. Cain found X inside a 14 meters high and 8 meters wide capsule in the ruins from Dr. Light's Laboratory. Dr. Light sealed X inside the capsule to check the reliability of his systems for 30 years.

The capsule is not seen in the original game, but appears in the remake Mega Man Maverick Hunter X and in other media. In the remake it is shown to have housed X while Dr. Light built him. In the Mega Man comic book series by Archie Comics, X's capsule has the same appearance as the Light Capsules.

Mega Man X4 capsules
Zero's opening scene shows him sleeping inside a capsule from the Hunter Base, and he has a nightmare that shows him inside a capsule while being built by Dr. Wily.

Mega Man X5 capsules
The final Zero Space stage shows two capsules in the background from Sigma's room. They presumably represent the capsules where X and Zero were kept before awakening in 21XX.

Mega Man X6 capsule
In Zero's ending, he is sealed inside a capsule to be analyzed.

Mega Man X: Command Mission pods
Lagrano Ruins contains twelve pods that were used to produce or modify Wild Jango, Silver Horn, Dr. Psyche, Mach Jentra, Scarface, Epsilon, and other six Reploids.

Mega Man ZX Advent capsules
Grey was found by two Hunters inside a capsule in a Mysterious Lab. The lab also housed the capsules used by Prometheus and Pandora.

Rockman X DiVE
The game's gacha is represented as a capsule.