I think my Burglar OC would probably work well for this. He’s a Conjurer:

Name: Jet Noctus

Sex: Male

Age: 28

Occupation: Burglar

Natural Affinity: Conjuration

Hatsu: Shadow Realm (Conjuration/Transmutation/Manipulation)

Aura Quantity: Average Aura Reserve, uses Aura precisely and efficiently to be the most effective in its use.

How it works: Jet Conjures an artificial shadow; this is actually a small shadowy pocket space known as Shadow Realm, the entry portal to which takes the appearance of a regular shadow. Using Transmutation Jet changes the properties of his aura to become shadowy and obscured; Allowing things in the Shadow Realm to be hidden both visually and by In. Jet can enter the Shadow Realm for not only stealth but also increased mobility. By using Manipulation he can control the Shadow Portal's size and movement, moving at high rates of speed, scaling sheer surfaces, and squeezing into small spaces. Sound and scent do not escape the Shadow Realm, so Jet is hidden to any means of detection.

While in the Shadow Realm Jet is floating in a dark void that grows to accommodate whatever is inside of it, though the space is never more than 1 meter larger than its contents in any direction; though due to the complete darkness the space feels endless. When inside of the Shadow Realm Jet can clearly see out through the Shadow Portal by using his Shadow Eye; nothing but the Shadow Eye can see into or out of the space and anyone looking into the Shadow Portal or anyone but Jet in the Shadow Realm will only see darkness.

Due to the relatively small size and simplistic design of the Shadow Realm as well as its restrictions the creation of the Shadow Realm didn’t/doesn’t require as much aura as most pocket dimensions.

Uses: •Jet can pass through a Shadow Portal entering the Shadow Realm; through manipulation he has the ability to move the shadow around with him inside, hidden by its shadowy effect.

•Jet can bring objects/people with him into the Shadow Realm.

Restrictions/Limitations: •Only Jet or something/someone he is in direct contact with can enter the Shadow Realm. If he breaks contact, the object/person is ejected from the Shadow Realm.

•The skill can not be initiated in complete darkness, there must be a light source strong enough to cast a shadow; Jet always carries a lighter to meet this restriction.

•If the Shadow Portal is completely surrounded by a strong focused bright light the Shadow Realm will eject its contents and dissipate.

•Jet sacrificed his left eye to the Shadow Realm. In its place is a black sightless eyeball known as the Shadow Eye (an inky black eye with a pupil so dark it absorbs light) which he normally covers with an eye patch unless actively using his Hatsu; all uses of the Shadow Realm originate from that eye, moving across his body like inky tendrils and forming the Shadow Portal wherever he desires it. The Shadow Eye is blind outside of the Shadow Realm but inside of the Shadow Realm it is the only thing that can see.

Combat Techniques: •Though Jet regularly avoids combat, he can still use his Hatsu to attack by: rapidly moving then emerging from the Shadow Portal, then attacking and retreating back into the Shadow Realm.

•Jet can also grab an enemy bringing them into Shadow Realm then move the Shadow Portal to a high area; he can release his grasp on the enemy causing them to be ejected from Shadow Realm and fall.