@Nator -
I never saw that in the Ikachan game; I know that picture is in the old OrgView though~ I'd say 95% sure although that is an official Pixel picture? It's a picture that was probably made a long time ago, [the old OrgView with old music; and of course it looks like it was just artistic fun
]
The only trustworthy quote I know that might shine light on Quote's hat lol Is near the beginning of the game...
Sue: Looks like you need a password to hatch this egg.
Sue: Well, crud.
Sue: If only my brother were here, he'd set things straight.
Sue: .....
Sue: All right, looks like I'm done here for now.
Sue: Are you from around here?
Sue: Doesn't look like it, does it.
****Sue: The words on your cap there...
****Sue: That's not a language they have on this island.
Sue: ...Did you get lost?
Sue: That's okay.
Sue: I'll let you come with me.
Sue: We can get off this dump togther.
Sue: In return, you're gonna help me.
So basically, your guess is as good as mine, although the only thing we know is it isn't related to the island And there might be a reasonable chance Sue can't read the cap, since she didn't say it; But it could be Curly Brace, or it could be a robot number... who knows
But, I'm pretty sure she wouldn't have said the language thing if it was ikachan
unless there were squid symbols all over lol
I do know I love this picture though
https://andwhyisit.bugsiteguardian.com/cstsf/broken9/cs_boxart.png
@f-ram.net here's Ikachan!
http://www.cavestory.org/forums/threads/306/
EDIT: Well if I were to say what I think was on the hat, I'd say it's something written in a robot's language~.... I just thought of a reason that might be a possibility. The Mimigas, the humans and the robots probably don't all speak the same languages; at least most of them due to the fact the old Mimiga near the end of the game says something to the effect, that not all robots were bad, there were a few that spoke... and he thought they had spirits or souls I believe he said. But, then again I guess he could be talking about all the ones that talk in the game [the alien looking ones, etc...] But, it's all in how you interpet it, unless I can find more evidenceee~
You could always leave it blank unless you have a specific idea~ I'll have to think on this...