Are there any possible ways for me to edit textures on PCSX2? For creative reasons. Dolphin, the Gamecube/Wii emulator has this functionality, and I've used to to do character modifications and menu modifications, and I was wondering if this emulator had any sort of version of that.
No, PCSX2 doesn't directly support such functionality.
Such activity falls squarely in the realm of ROM hacking. It's doable, but really comes down to whether the game's textures can be decrypted, edited, then repacked into the .ISO file.
Would you know if it's possible in Kingdom Hearts? More specifically, the title re-released in Japan as 'Final Mix'. Or is this something that isn't supported on this particular forum?
Say, recoloring characters, or weapons. Oh, and that's 'Kingdom Hearts 2 Final Mix', not the first title, they haven't translated the first one, I believe.
I did some digging, and it seems most of the hacking efforts have been concentrated on KH2 and KH:BBS. So I'm sorry, but I don't think there are any hacking tools available for KH1.
With the caveat that I have no idea what I'm talking about, I think it might have had less to do with the N64 itself and more with the maturity of the N64 emulation scene. N64 emulation became completely functional while the N64 itself was still a relevant console, so emu authors had the luxury of focusing on things like texture replacement. Also N64 games had terrible textures by default and that created a large amount of interest early on in texture replacement projects.
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I also have a lot of fun LEDs in my case, which help me look like a pro l33t gamer, and also function as nightlights because I'm mortally afraid of the dark.