Fire Emblem's Roy and Street Fighter's Ryu may be joining the Smash Bros. Wii U and 3DS character roster, if leaked footage of the two characters in Nintendo's all-star brawler is to be believed.

Although the duo have not officially been announced, two short gameplay videos were posted on the Smash Bros. subreddit.

It is worth noting that in April, someone who had been data-mining Smash Bros. for Wii U and 3DS posted a list of sound files from the game. Included in that list were both Roy and Ryu.

Real or not, it would be wise to treat the leak with a pinch of cynicism, as people have been known to go to extreme lengths to create a believable Smash. Bros fakes in the past. This video of Ubisoft's Rayman being added to the character select screen is a good example.

If it is indeed real, it's likely that Nintendo was planning to reveal the characters at E3 in a few days. Given that the videos show actual gameplay of both characters, they are more believable than other supposed leaks have been in the past.

Assets such as renders for both characters, stages, and alternate colours have also been posted online, giving further credibility to the information. Other noteworthy aspects of the leak include Mii Fighter costumes for Zero, Isabelle, Megaman.exe, Heihachi and Akira.