[Fish]

Not to mention it's really irritating when I actually /want/ the "di" sound in katakana but I can't fricken type it x.x'

Anyway more often than not (except with things like 大きい　おおきい it won't be おお but rather おう I mean obviously there's a few exceptions but it's easy enough to memorize those.) and typically it's never ええ but rather えい which is pronounced just like ええ.

Not... sure if that's what you meant, though. Or just the romanization >3<' /shot

OMG I really hope I get my pens in today >3<