Is there a reason for this? I've occasionally used characters because it seemed more appropriate than symbols, e.g. I'm having a hard time regarding using hobby MF font with LaTeX, adding accented characters as being about "symbols". One way or the other, we should use the tags consciously; seeing that character is a synonym of symbols already, characters should probably be a synonym as well because there's no relevant semantic difference between singular and plural.
Edit:
Having learned more about how our tagging system works, character should proabably be gotten rid of, if characters is made a synonym of symbols.
Edit2:
Alright, now both tags have tag wikis that emphasize the difference between them, and we're kind of using them accordingly:
{symbols} is about specific non-alphabetic symbols or math symbols, e.g., about looking-up, constructing, or using symbols. For questions about {fonts} or alphabetic {characters} use the respective tag instead.
{characters} is about the regular alphabetic characters that are part of some script in a language. For accented characters, add {accents}. For non-alphabetic characters, use {symbols} instead.
As long as we're not doing any merging (and I'm actually not sure that would be the best idea), I'd say let's fix the weird synonyms for starters!