Done with characters. I had to make a bunch of new tags for them all. I can't change their type from general, so if anybody were willing to do that for me, I'd greatly appreciate it.
I'm not going to tag them. Done enough work already.
A few things about the characters.
The ghosts are called Yu and Rei, and are usually seen together. The tag yu was already taken, so I had to make a yu_(puyopuyo) tag. However, the rei tag wasn't taken, but I made the rei_(puyopuyo) tag anyway, to correspond to the yu_(puyopuyo) tag.
Secondly, while ocean_king has a human form, I didn't think it was important enough for a tag, so I didn't make one for it.
Lastsly, while the actual form of ekoro doesn't appear here, the reflection beneath Ringo bears many similarities to him, so I labeled it as him.
Now that's some tagging dedication! There are two ways I know of to change tag types. The one from the Tags page you seem to know, but you can also do it while tagging:
art:___ or artist:___ char:___ or character:___ copy:___ or copyright:___