Purpose of blank/unused values in character blocks

[Topaz Light]

Heya!

So I was noticing that there are a bunch of "Unknown (Zero)" variables present in the character data blocks, and I was curious; does altering those screw anything up? The real question here being, could I repurpose them into something else, like, say, additional stats, weapon levels, growth rates, etc.? I realize doing so would require ASM modifications to be done elsewhere to make it work, but if it is possible, that'd be super cool and open up some awesome new possibilities.

[Agro]

you can, but be advised that a lot of the so-called unused bytes are actually used but their purposes weren't determined when those modules were made