Item Auto Status, & etc

You can use FF3usME to edit them: https://imgur.com/a/DXkbfrs
It'll be in the Gfx tab>Small Font

You can also use YY-CHR: https://imgur.com/a/aYyKw19
Pay attention to the settings I have there to view them correctly.
There is not a list of item icon images here, you'll have to find or make them. You can grab ones easily from FF4 or FF5:
FF4 - https://imgur.com/a/tT93zq4
FF5 - https://imgur.com/a/9uWu4Rk

There are a whole bunch also in RotDS, I don't care if you use them, just be sure to credit the 'Pandora's Box Team' if you do use them and your hack goes public, because a bunch of those I got from that (dead) hack:
https://imgur.com/a/1Lm04aL, https://imgur.com/a/8jf1kCO

The Icon names can easily be edited in FF3usME also, here: https://imgur.com/a/q1NrjK2
Can alternatively use a hex editor and the correct table file:
https://imgur.com/a/88BpXIn

I'm also now thinking about writing up an Item Icon Expansion tutorial, as I don't believe there exists one as of yet. But I'm not exactly sure when this would be. In the meantime I'd recommend learning everything about using FF3usME, there's a whole lot you can do with it. And take the time to search the site and the wiki page, this game is so well documented and you will most likely find information you're looking for by searching around a bit, before just making a new topic to ask for something - it's usually been asked before and there's an abundance of information and documents to get you going on most things.

Oh, didn't know FF3usME have this feature. Thank for the FF4 & 5 example too. Lastly, is there a way to expand the icon name to more than 7 bytes?