MultiCity

MultiCity Hub: The Hub is where characters go when they leave their dimension via a portal. The Hub is a neon futuristic city on a floating island in the middle of space where characters hang out and explore beyond their home universe, seeing the city and many other characters in it.

Universe codes: Every universe has a 6-digit code that can be used to travel to a specific universe in the Hub. In the Hub are the Portal Stations where a metal circle containing a portal is placed in corners across the city and next to the portal is a small keypad with 9 squares resembling 9 numbers next to it. Characters type the 6-digit universe code on the keypad and can go back to their home universe or travel to others.

Cel-shading: Some characters specifically anime characters are 2D and to enter the Hub you have to be 3D or else it gets very confusing. So to solve this problem the Multiverse makes the 2D animated characters 3D but with Cel-shading to make them still faithful to the original 2D appearance without turning 2D and to make them less uncanny. This is for characters originally made in 2D so characters already in 3D to begin with don't get Cel-shading