Ness is a startable playable character of Ultra Smash Bros. IV and the protagonist of his own RPG series EarthBound (Mother 2 in Japanese). He makes his fifth appearance in the series. Ness was confirmed at the E3 demo and trailer with the Original 8, including Luigi, Captain Falcon and Jigglypuff. Ness has psychenetic, telekenetic and pyrokenetic powers, used in all the Smash series, like PK Flash, PK Fire, PK Thunder and PSI Magnet. Ness has a semi-clone character Lucas. He has the same special moves as Ness with different styles, except for PK Freeze (adding PK Freeze for Ness as a custom special move doesn't count).
Ness' voice is recorded once again by Makiko Omoto, who also she records Kirby's voiceclips. Her voiceclips are recycled from SSB4.
On the tier list, Ness makes a great improvement to the 15th place of the 103th (A-) behind Toon Link and after Samus making him a top tier character. Tjis is a significant rise for Ness being a mid-tier character in Smash 4. His back air attack makes a direct hit instead of lag but with a sweetspotted position. Ness is good at trading damage with neutral-air and comboing with grabs and consecutive use of his forward air, also useful for defensive play. His PK Fire is great combo starter for anything. His PSI Magnet is also useful to absorb incoming projectiles and heals himself. His landing frame is lagless which it makes Ness more agile. His flaws is the the use of his PK Thunder (his up-special) off the stage for his recovery, he must be very precise to get at the stage with different angles of his thunder recovery. But with his PK Thunder, he can juggle opponents in the air. Also his PK Flash is very hard to control at the opponents but it give amount of power, probably one of the highest percentage knockback of the game. Ness' matchup is great in overall but his own worst matchup is against the Ice Climbers and Sheik.
- It was confirmed that Ness includes Ninten's alternate costume.
- Ness is for the third time a startable player since Melee and Smash 4 for Wii U.
- Ness' Final Smash, PK Starstorm has blue starmeteors, different to Lucas, purple starmeteors.