Ultraman Cosmos is an Ultra known for his calm and gentle fighting style, and his compassion for monsters. Between his titular series and three tie-in movies, Cosmos had traveled to Planet Earth multiple times and bonded with Musashi Haruno.

Cosmos generally does not destroy his enemies with any damaging abilities, as he would use certain abilities or transform into certain forms depending on what being he was fighting. For example, if Cosmos fought a simple misplaced or aggravated monster, he would use a less aggressive fighting style to not hurt the monster as much as possible. Cosmos would then calm the monster down using cleansing or purifying abilities. However, if he fought a sentient and evil being, he would be forced to destroy the aggressor with a more aggressive fighting style and more lethal abilities. His fighting style in Luna and Corona Mode has been compared to the Crane Style of Chinese martial arts and Tai Chi.

Luna Mode is Cosmos' default form, which is fast and boasts impressive mental and energy abilities. His blue form represents the 'kindness' of Ultraman.