It looks like Nintendo's fighting game Arms will be getting more new characters in future updates, as dataminers have posted a list of fighters on Reddit, showing the names of nine unused characters, which you can see below (the names in brackets are existing characters):
"• Belt (Max Brass)
• Chain
• Coil
• DNA (Helix)
• Hair (Twintelle)
• Mee (Min Min)
• Mummy (Mummy)
• Ninja (Ninjara)
• Plant
• Police (Byte and Bark)
• Ribbon (Ribbon Girl)
• Robo
• Scroll
• Snake (Kid Cobra)
• Spring (Spring Man)
• Sumo
• Surprise
• Sweet
• Twintale
• Worker (Mechanica)
• BossHead (Hedlok)
• RNA (Dummies)"
An update for Arms is also coming this week, and according to the official Japanese Arms Twitter account it will add balancing adjustments and "other additions". Could there be a new character on the way?