So I have run into quite a few players who do not understand why NEI does not work for Superheroes Unlimited. This is because the mo uses its own crafting tables, like the Suit Assembler. To make NEI find the recipes for suits and blocks, just follow these instructions below:

-First go to your start menu and type %appdata%, then select the roaming folder
-Inside roaming there is a folder named .minecraft, then find the config folder
-You want to find a config named: SuperherosUnlimitedMod.cfg, open this with notepad++(or whatever you have on your device)
-Scroll through this file till you come to a line that says "game rules", here is the pat you need to alter
-under the "game rules" section there is a text line that says: All Crafting Table Recipes
-Notice after that it says false this you need to change so delete the false and write true in its place
-Now that the config has been set, use control key+S to save the change you have made.

And that's it! now launch minecraft with the mod and press U while hovering over the item and it should show the recipe.

I hope this tutorial was helpful in some way!