I already found the one thing I lost. The artist still had it up on their personal site, just not on Pixiv. On that note, that's a pretty good thing to check if you can track down their site.
>>2971030Most wikis for fandoms have things listed in the original characters. It can sometimes be unintuitive typing things out yourself, or names will be in kanji rather than hiragana or katakana. Don't use google translate, almost nothing it spits out will be of use. For general tags, just find a picture that might be tagged with what you want, and see if any of the tags on it are what you're looking for.