
Having any content doesn't mean announcing a new Fighter. Here, these contents seem to be closed doors.
Obscure reps
• Grasshopper Manufacture: credited for a music (Brawl).
Then Travis Touchdown appeared as an Mii Costume (Ultimate).
Explicit reps
If any of these companies should appear, their case would only be comparable to
Pac-Man and
Banjo.
• Arc System Works: River City as spirits (Ultimate).
Will we have Sol Badguy? I think the representations of SNK, Street Fighter, Tekken, Virtua Fighter, then Min-Min now form a closed door to other rep from fighting series. So I think there won't be any fighter from Arc System Works.
• Arika: AR Games as a music (Sm4sh), then Tetriminos as spirits (Ultimate).
• Bethesda: The Vault Boy as a Mii Costume (Ultimate).
An interview disconfirmed Doomguy, so the Vault Boy formed a closed door to Doomguy.
• Hudson Soft: Ballyhoo & Big Top as a trophy and Mario Party series content (Sm4sh).
Then Bomberman appeared as a Assist Trophy, a Mii Costume and a Spirit (Ultimate).
• Koei Tecmo: Mayu as a trophy (Sm4sh 3DS), Mio & Mayu Amakura as a trophy (Sm4sh Wii U). Yuri Kozukata as an Assist Trophy and a spirit (Ultimate). The spirit artworks of the Moon (TLoZ: MM), Impa, Master Kohga, and the Diminutive Guardian (HW: AoC) are credited KT (Utlimate).
Will we have Hayabusa? I think the Hyrule Warrior ninjas now form a closed door to other ninjas and warriors; I can't imagine Hayabusa being teased by Impa and Master Kohga. Moreover, an interview disconfirmed Ryza, so I seriously think there won't be any fighter from Koei Tecmo. It doesn't seem so strange to think since characters as important as Bomberman have been refused.
• Marvelous: Daemon X Machina as spirits (Utimate).
Will we have Farmer from Story of Seasons? I think that no series could better than SoS to represent Marvelous. But, what does a little farmer weigh next to a great miner? I think Steve forms a closed door to Farmer.
• Ubisoft: Rayman as trophies (Sm4sh). The Rabbids as spirits and Mii hat, Altaïr as a Mii Costume (Utlimate).
Then? The door seems firmly closed.
Other destinct companies without Fighters
Activision - Blizzard - Core Design (Tomb Raider) - Epic Games - FromSoftware - GenDesign (new Team Ico) - Level-5 (except Eight Hero as a very obsure rep) - Nihon Falcom - Nippon Ichi Software...
Activision, Blizzard and FromSoftware have Amiibos.