The eyes that will haunt you in your sleep forever.
- Hedlok. It resembles a mechanical skull with two pairs of arms extending out of it. In the Global Test Punch, it's seen on top of the bodies of other fighters, implying it takes control of a host in order to administer a six armed beat down. With the full game released, it does exactly that to the final opponent in the Grand Prix, using three pairs of the arms the previous opponent used.
- The 5.0.0 update gave Hedlok a new battle theme to go with his Level 8 battle theme. The first thing you hear from the song? Hedlok himself screaming in rage, which then goes into a hard rock/metal remix of his theme with an ominous choir across the whole song. It gives off the impression that Hedlok isn't just out for a fight, but now wants to kill you.
- DNA Labs. The place has dark green lighting and the aesthetic makes it look like a highly-questionable establishment.
- Springtron. His deep robotic voice, dark color palette, and his distinctive lack of movement on the character select is quite unnerving.
- You thought Hedlok was bad? You thought Springtron was bad? You haven't met their creator. Dr. Coyle, the closest thing the game has to a Greater-Scope Villain, is responsible for Helix, Hedlok, Springtron, AND the Party Crashes, and when she finally steps into the ring she proves absolutely nightmarish due to her constantly floating, making ground hazards useless against her, and the fact that she is almost always seen either smirking confidently, or grinning like an absolute maniac. It's also stated that she experimented heavily on herself to obtain her ARMS, which may have resulted in her unstable mental state. Oh, and if you win round one of her boss battle, she summons Hedlok to make herself stronger. If that fails, she DESTROYS HIM, floats up, and vanishes.
- Hedlok's victory pose if it's controlling Dr. Coyle. It's arguably creepier than the version where it's controlling Max Brass. While both of them laugh maniacally, in Dr. Coyle's case, first there's her voice being distorted, but then there's how long it lasts compared to the other victory poses Hedlok has. Put the two together and they make a nice Nightmare Fuel sandwich.
- The ARMS themselves qualify. With the exception of Kid Cobra (who was born with the phenotype), all of the characters randomly developed their ARMS in their sleep, and just woke up the next day mutated. Nobody knows why it happens, nobody knows when it started, and it's been popping up in the world for anywhere between 1500 and 4000 years. The masks all of the human fighters wear are the only reason that they have any degree of control over their ARMS, and they can switch between normal function and flopping around uselessly otherwise.
