Shizuku Yaegashi's Tsumehirameki (Arifureta Sekai Saikyou) was enchanted with the spatial magic spell Flash Blitz that allow it to cut through space
Aoi Nogami (Absolutely Lovely Children) can teleport at a quantum level, allowing her to achieve her "Quantum Cutter" technique, earning her the nickname "Lightspeed Goddess".
While wearing one of her strongest armors, the Nakagami Armor, Erza Scarlet (Fairy Tail) is capable of cutting through Space itself.
Kenpachi Zaraki's (Bleach) Zanpakutō, Nozarashi, offers such tremendous offensive power that he can actually slice through space itself, doing so to reach Gremmy from afar.
Agnese Sanctis (A Certain Magical Index) using the Lotus Wand to manipulate ether, having it to affect the airspace to create coordinate slashes in space.
The Skull Knight (Berserk) can use his Sword of Actuation...
...to slash open vortexes in space.
Vergil's (Devil May Cry Series) Devil Arm: Yamato can distort space to slice through anything, even sever the dimensional pathways between the Human World and Underworld...
... and cutting open spatial portals for teleportation.
The One Being Sought (Code:Breaker) using Sever to remove slivers of space along the movement of his fingers, severing through any and all matter.
Kuro'udō Akabane (Get Backers) using his Bloody Sword, which can slash through space and time.
Okuyasu Nijimura's Stand, The Hand (JoJo's Bizarre Adventure Part IV Diamonds are Unbreakable) erasing the sections of space he touches, along with any objects inside, in such a manner that it seemed to be slashed by an extremely sharp blade.
Tsubame Fury (Kagijin) using the Splitting Void technique to slice through a monster, and anything within his field of vision, with ease; distance is of no issue.
Palkia (Pokémon Adventures) slashing through space via its "Spacial Rend", creating a tear in the fabrics of reality.
Keith Green (Project ARMS) tearing out slivers of space and tossing them aside, which in turn tears apart any object occupying the said location.
James Huang (Project ARMS) is Keith Green's genetic originator, using the "Magic Sword of Answerer" to create a large area of slashes in an attempt to corner Iwao.
Iwao Takatsuki (Project ARMS) using the Jabberwock's claw to slash through space, bisecting his brother James.
Using his odachi, Leonardo (Rise of the Teenage Mutant Ninja Turtles) slashes open space to create portals for teleportation.
Raven Branwen (RWBY) slashes open space to create a teleportation portal using her sword.
Sayaka Kirasaka's (Strike the Blood) sword, "Kōkarin", can cut through anything by severing the spatial connection of whatever it touches.
Muzét (Tales of Xillia) can manifest her power into a sword that can slash through space.
Mukuro (Yu Yu Hakusho) slashing through the third-dimensional space with her hand, splitting two sections of space and leaving dimensional lines that cuts whatever touches them.
The Yin Blade (Lego Ninjago: Masters of Spinjitzu) can tear open rifts in the very fabric of reality itself thanks to its incredibly sharp blades.
Yang (Lego Ninjago: Masters of Spinjitzu) using the Yin Blade to tear open the Rift of Return.
Arthur Pendragon (Highschool DxD) wields the Caliburn, a holy sword with spatial powers, enable it to rip through space
Within his ROOM, Trafalgar Water D. Law (One Piece) can control space to extend the slashes of his Kikoku...
...allowing him to slice through anything on a massive range...
...and while using its enhanced version Radio Knife by charging his sword with spatial electricity to slash an opponent apart which separates them into several segments while suffering an electric shock.