That would be awesome!  Can you make that?

it would be cool, have it so it can do both Pi and Serenity style. I had one in TI-BASIC before but it was too slow so it was too tedious to use

This sounds awesome! Good luck, and I wouldn't mind the time. (Though max for me would be about 1 minute.)

Alright, the utility is nearing its completion, I should have a working version out by the end of today  It will support both Duel and Shifted Text Sprite graphics, and fuzzy logic to find close matches

Um probably not as I don't know of any way to write to files, but It will display the two characters needed to make the combined sprite, and you could write them down if you wanted to.  Its not really a Storage program, but more like a program to find the right combinations of characters to get a desired sprite.

Alright here is version 1.0.0

It supports both Duel and Shifted text sprites, and a snappy interface .  Click on the pixels to toggle them, a preview will appear in the bottom right.  Click the search button to search for potential matches.  They will be displayed on the right in descending order, with best match on the top left and then moving in columns to the right.  Some simple graphical tools were implemented, but nothing fancy, just Invert and Clear.  Press the Shifted button to switch between shifted and non-shifted tiles.  Move your cursor over a preview to see the two tiles that are used to make it, they appear in the bottom middle underneath all the potential match previews.

oh wow you even did a searcher for them nice. Would it be possible to have a mode where you can view every characters and let you combine them, tho, or would it be too hard?