If the uploader hasn't added a tag with the character's name, it's difficult to search for them. I suggest adding a new "Name" filter field.

Alternatively, you could automatically add tags to characters based on their names (e.g. a character named "Joe the Dingo" would automatically receive tags for "Joe_the_Dingo", "Joe", and "Dingo"; words with no identifying benefit, like "the", would be omitted as individual tags.)