Slash is a legendary sword of the Psymonster World, who is famous for his skills, magical powers, and his deep sense of honor. He will never break a promise or refuse to help a friendly Psymonster in need, and the only reward that he ever accepts for his trustworthy, faithful, and noble deeds is a nice cup of hot chocolate afterwards. Slash's only problem is that he is so extremely serious all of the time. Any Psymonster can try telling him a joke, showing him a funny picture or even tickling him, but he will never even crack a smile. It is understood that he once laughed at one of the gags for the entertaining and whimsical Psymonster, but if any Psymonster asks him, he will positively deny it.
He is a big black sword with a light gray blade, gold lips, red eyes, and a teal jewel-like nose.
- The name "Slash" means cut with a violent sweeping movement, typically using a knife or a sword.
- Slash is one of the 44 Psymonsters who have no legs (the other 43 are Planto, Zoidburger, Gingersnap, Sundrift, Catfish, Colossus, Putty, Snakegrowth, Mystical, Waxcandle, Angler, Robotical, Sheloden, Kennywheel, Sprout, Scary, Thunderquake, Cobracious, Creaturous, Greedy, Queasy, Transparent, Watermelody, Aquamarvelous, Trampedo, Waxcleaner, Oceanquake, Lunar, Snowmelter, Drivacuum, Stumpback, Elasmountain, Concordian, Conqueror, Puffy, Schizophobia, Tester, Mytherian, Booter, Telephone, Extraordinarium, Bargeria, and Coolberry).
- He is noticeably similar to Excalibur.
- Both are legendary swords.