Here is a guide on how to create and share your arcade character.
Create character

In the “Customize character” menu you can crate and customize your character .


Find files
%USERPROFILE%\AppData\Local\Delirium\characters

UGC
Copy the .dchar file you found earlier in to UGC folder (the file with your character name , NOT steam_autocloud.vdf !)

Uploading


Fill in “Item name” and “Item description” .
Also , you can change “Item visibility” .
If everything is in order, in “Item Tags” you will see “character” .
After this message appears you can close the game .
Make it visible

Thanks to Grif_on for his great guide, all credit to his effort. you can also read the original guide from Steam Community. enjoy the game.