Guest B

Guest B is a pre-loaded Mii available for use in titles that feature Mii support, which includes Wii Sports Games, Wii Party games, SSB4/Ultimate, and other games with Mii support.

He has white skin, brown hair and blue eyes. His favorite color is dark blue.

Super Smash Bros. for Wii U & 3DS
The design of the Mii Swordfighter used in promotional material and in-game renders is based on an edited version of Guest B. Of the three, the Mii Swordfighter has the least drastic change in design; simply changing the design of his hair and widening the eye placement a bit.

Super Smash Bros Ultimate (Switch)
He (as a Mii swordfighter) is edited again, this time with a different hairstyle (same as Jake's or Barbara (WSR)'s, except in a different direction), hair color and his body has been made into more human-like.

Trivia

 * You could have earned his badge for making 5 edits on "CPU Mii" articles, which is now disabled.