Y'mind if I go through the "harry_potter_(character)" tags and change 'em to his full name (looks better, I think)? Are there any pics with him that a regular user can't see (I'd imagine, given their ages when it starts)?
harry_potter_(character) loli -- exactly one. But such things are better handled by an alias, so there's no need to do it manually. Just request an alias.
I don't know how common his middle name is in normal usage, but it's Harry Potter and only 25 images so I don't care enough to worry about it. So, alias added.
IIRC back when we had a lot more oneword tags I instituted harry_potter for the character keeping harrypotter for the series, but they were at some point aliased leading to the harry_potter_(character) tag. The full name is a lot more user-friendly having 100% less parenthesis.
As others said. It was only done to Harry because it got rid of the need for a qualifier. We don't *have* to do it for the others, so I'm leaving them as is.
It appears the ashe tag is already taken by the rockman_zx character (i.e., post #302952 and post #302969). There are only three posts using the tag, though you're going to run into the qualifiers problem again.
Many tags starting with a "/" are shortcut aliases. For example, /h is suzumiya_haruhi, and one-letters are some popular tags, like /b is aliased to breasts and /t is aliased to thighhighs.
The slashes are for shortcuts there are a lot of shortcut aliases in the system. For instance /hig searches for higurashi no naku koro ni /mlsn searches for mahou shoujo lyrical nanoha, I could list more but you can search the alias list for / if you want to see everything we have shortcuts for.