Final Fantasy VI: Ray of Light

I know that if you're still working on this project, that you're likely trying to figure out how to add more room and whatnot. There are two places in the ROM that can be essentually removed entirely to make a LOT more room. The first is the character-class-name and Bushido-skill names that were renameable in the japanese version. The second place is the entire Cyan scenario in the WoR (which can be reworked into a MUCH smaller coding scenario than what it currently is), as PowerPanda delightfully pointed out. These two areas would give you a LOT of extra room to add your own things in.

Also, JCE3000GT made a document showing other unused spaces in the ROM as well. Here's a link for that. https://www.ff6hacking.com/forums/thread-3489.html

As for Relm's Sketch, the two big problems with it is #1. It relies on the Monster's stats, and #2. It pulls info for what to do from a list with only two attacks (same situation as with Gau's rages).

seibaby provided an ASM coding-patch (in text format you have to copy/paste into an asm file, no direct patches available atm) for how to change Sketch to use Relm's stats. https://www.ff6hacking.com/forums/thread-3478.html

There has also been a patch made expanding the Sketch and Rage list by using the "Control" list (as it has four options to use instead of two). https://www.romhacking.net/hacks/1395/

It may be possible for you to also remove those unneeded Rage and Sketch lists if you're using the Control-list as a "Master" list for those two commands, which would allow you to do more things with the extra room.

As for what you can replace Joker Doom with, have you considered a Bad Breath type of status attack? Something usable even on Bosses?