The Interdimensional One (John Red Robin)

Either through experimentation or by accident you somehow fell through your reality, no clipping on a journey into a multidimensional space. It could be the area between space and time, the fourth dimension, or a pocket plane beyond mortal understanding. Somewhere  with non-Euclidean structures, infinite hallways, and impossible geometry. Somehow you are able to survive your journey returning back to your reality forever changed by your experience. Imbued with the magic of the realms you traveled through.

Your experience has left you forever marked in some way, roll 1d8 to decide how;

1. Your body's physiology is mirrored from what it should be (Justice League vs the Crime Syndicate)

2. Your color pallet and art style is different then your current surroundings (Spider verse)

3. You are yourself but of a different timeline where you are a different race/gender/nationally/generation then what you started your journey as. (Spider verse)

4. Your eyes and the skin around them have changed color and or are cracked/damaged. (Dr. Strange)

5. Things are slightly off from how you remember them. Examples include spelling of words, world leaders, quotes, or small details in famous pictures. (Mandela effect)

6. You have picked up an illness or condition that is foreign to this world that can not be spread but can't be cured.  (Color Out of Space)

7. You have lived for what feel like an eternity but your conciseness has returned to the point before your journey began. (Narnia)

8 . You have scars on your body that nothing in this reality could have made.(Dudes of Hazmat)

Unlike other warlock patrons this not one specific being but more a place/location that you draw power from. 

Entities of this type include: R'lyeh (The Call of Cthulhu), Tindalos (The Hounds of...), Carcosa (The King in Yellow), MC Escher painting, The Dreaming (Sandman), The Infinite Corridor (Castle Vania), The Dark Tower, a black hole, The Backrooms, Through the Looking-glass and what Alice Found There, Mandela County, The Web of Reality (Spider-Man), The Dark Dimension/Mirror Dimension (Dr. Strange), Omega Mart, Nightvale, SCP-3008, House of Leaves.

Expanded Spell List

The Interdimensional One lets you choose from an expanded list of spells when you learn a warlock spell. The following spells are added to the warlock spell list for you.

Interdimensional One Expanded Spells

Spell Level	Spells
1st	entangle, longstrider
2nd	Blur, rope trick
3rd	Blink, haste
4th	private sanctum, freedom of movement
5th	passwall, teleportation circle

Interplanar Traveler

Starting at 1st level, your experience in the alternate plane gives you the ability to alter to pull of magic. When you are the target of a spell or ability that would cause your character to be forcibly moved you may change the direction as long as you still move the same amount of distance.

You can make your presence weaker in this plane. You can take the Disengage action for a bonus action. 

Folding Space

At 6th level, you learn to command some of the magic that brought you to a new plane by bending the fabric of your dimension around you. When you cast a spell that causes forced movement you can use your reaction to double the distance traveled. this works both for spells that target you, an alley or an enemy.

You have spent  a lot of time walking through surfaces and have become use to the sting of flesh being caught in solid surfaces. You are now resistant to force damage 

4th Axis

Starting at 10th level, When you use an ability that would forcibly move a creature or object  you may choose the direction it moves even if that direction isn't a straight line. You may move the target through other creatures, objects, or walls as if they were difficult terrain. If the target ends its turn inside and object, creature, or wall it is shunted to the closest open unoccupied space. The target takes 1d6 force damage for each 5ft of occupied space it has to pass through to get to an open space.

You appear to not obey the laws of physics on this axis, You have advantage against being Grappled.

Alternative Relativity

At 14th level, you gain the ability to tap into the space around you feeling everything on your current plane then you can move it with the forces that affect the odd Plane that you draw power from. As an action you gain tremor sense for 60ft and can spend your movement to forcibly move any number of target creatures spending 5 ft per square you move a target.

You can use this action once per short rest.