We don't need character tags at all, never mind the meta tags you've listed in the question.
Anyone who has listened to my whining about this before can skip this, because I'm just banging the same drum I have been for some time now. Still;
The best way we could approach tagging on this site would be from the perspective of what I've just now decided to call the Individual to Broad hierarchy. The basic concept is that we tag based on the individual work(s) the question is about, the franchise those works belong to (if required), and then the (again, if required) the over-riding intellectual property on which the work/franchise is based.
Using a hypothetical question about The Dark Knight as an example, we would tag that as the-dark-knight, nolan-batman-trilogy and then batman (as the over-riding intellectual property, NOT the name of the character).
In just three tags, we cover people interested in any of the possible levels at which they may want to see this question. People looking for questions about The Dark Knight find it, people looking for questions about Nolan's trilogy find it, and people interested in anything to do with the intellectual property of Batman find it too.
Obviously, not all of these "levels" of tagging will be required in every instance - for example, a question about Futurama would only have one tag as that show doesn't belong to a larger franchise or intellectual property (at least as far as I'm aware).
In conclusion - no we definitely don't need the general character tags (which are meta tags) that you've highlighted there. But we also don't need specific character tags either.