Reshiram is a large, white, Dragon-like Pokémon that seems the share its theme with its counterpart, Zekrom. It has striking blue eyes and several white rings around its thin, swan-like neck and flowing tail, with a single band around each of its hands. It also has feather-like arms that end in four claws and a flowing white mane. Its chest feathers resemble the design of the Silver Wing. The lower portion of its body protrudes outward to a point.
In Movie 14, Reshiram has the same roar as the monster Megaguirus, from the Godzilla franchise. Originally, this roar was Zekrom's, but for Movie 14, Zekrom was given the roar of Baragon, also from the Godzilla franchise. Megaguirus' roar had previously been used in Movie 11 when Zero's fighter released an attack.
Reshiram also appears in a Dream World minigame; if the WIFI Reshiram from the White version game is sent to the Dream World, in the special home Victini appears to the player, and in the minigame's intro, Victini fails to destroy the barrier alone, so the player must ask his/her WIFI Reshiram to help destroy said barrier by collecting power ups, and at the end, Reshiram destroies the barrier by using a flame attack.