"Kiss: Psycho Circus: The Nightmare Child" is clearly over 25 characters, so how should we abbreviate this tag? I made the tag kiss-psycho-circus-tnc just so we would have something to put for it on the question that just was asked about it, but I'm not sure if this is the best way to abbreviate it. Thoughts?
After some brief research, the game appears to be based off of the comic book series Kiss: Psycho Circus. Since that title is the overarching series, it'd be the most easily identifiable part of the game's title. As such, I think the tag you've created works just fine.