The reason it's not working in the "normal" dialogues could have to do with the DTE. "Normal" dialogues use a compression technique that assigns certain combinations of two symbols to one hex code. So for example there's a single code for a space " " followed by an "e". When FF4kster sees that code it prints " e". If you assigned one of your squish tiles to something from the DTE table it might cause that kind of mess up.
Hmm, that would explain why one of my squish tiles comes up as "th"... but I might luck out at some point and come across some combinations I'm looking for when testing out new squish tiles haha.
Also, finally got internet on the new computer! Now I don't have the navigation cutting off my view of half the top topics lol. Anyways -
@ Grimwoire LD
lol yeah I tried looking around to see if they had last names, but as you said, they don't. Though I saw the word for mist in Japanese translates to "Misuto", so far now at least, Rydia has a last name. Better than Rydia Jones anyway haha.
For Tellah, since I gave him a Scottish accent after doing so with the npcs in Kaipo, so I gave him the last name McLeod. Tellah McLeod. Turning him into an angry Scotsman is quite fun. So is saying Tellash's name with a mock Scottish accent.
As for Palom and Porom, I couldn't quite figure out a good name, but the holder name they have right now would go great with what I'm planning for after the Cainazzo fight.

With FuSoYa, I dig what you're saying about his and KluYa's naming, being that they're aliens. Until I come up with a better name, something more align with how his first name's spelled, FuSoYa's last name is Moonba. Not the best, but it flows off the tongue pretty well.
As for adding squish tiles in FF4kster, it's nothing short of awesome. And there's a nice big open area in the rom for adding squish tiles/ extra item icons!
And when you get around to your FFIV Prequel, feel free to ask for the squish tile. Hell, you can use the modified SotS font I'm using if you'd like. I've tweaked it a good bit, mainly fixing some spacing and getting rid of some of the unnecessary pixels since Tecmo was so hellbent on making their mostly unused small case letters so "fancy". A good bit of the Uppercase letters were left alone, but some, like the "N" and "R" I changed to look a bit better.
Today I'll be messing around with spells and items.

I turned
Venom, Viirus, and Weak in the 3 Bio spells last night, and after an hour of two of finding a good effect to go along with the Bio sequence, I found a pretty nice setup:
Bio - It's the same as Virus was animation-wise, with slightly higher power and mp cost than Fire, Ice, and Bolt. Has a slight miss chance.
Bio 2 - Bio Sequence + Cure4 effect
Bio 3 - Bio sequence + Holy effect - a wave of diseased birds swoops down on your foe/s, causing an awesome Bio effect. I shit you not. The second I saw this I luaghed so hard that I just had to keep it.
Today I want to see if I can rig up an Ultima spell, using Fission's sequence and the Center explosion spread to the left effect haha.
Need to look into how I can change the "GP" in the menu screen to "Gil". I might have to break down and try a hex editor for that one. That'll be... fun if not a bit intimidating at first lol.
Also finally realized there's an option to change which items do and don't have item descriptions. I wonder how many items can have a description before the game falls apart lmao.. I'm thinking of for the items that don't have a description, just use a blank description box so you don't have to see it appearing and disappearing as you scroll through your item list.