If they kept on fighting in a straight line and just sort of responded you could say they're bots. I know that when I played Maple Story, there were bots that could do facial expressions and "talk" as well.
The king guy may be an actual person but those other ones could be bots who are being powerleveled? I don't know how those gold sites work so those characters could possibly be used by someone else who paid to be power leveled. Either way, you could report them for harassment and whatnot. Possible botters will be under the GMs surveilance once reported.
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