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Wasn't the riddler hint a scepter or something. Hawaii was one of the few states that used to be its own recognized country, and it had a monarchy. Said monarchy was founded by Kamehameha and conquered and united the place before it could be cut up by colonizers.
Fighting would fit because conquest and warrior stuff.
Steel I guess could also fit if they wanted. He immediately traded for guns and cannons with Cooke as soon as he boarded the ships. Not a solid reasoning, but they could justify a steel typing by just a description of having hard scales/ name.
Albeit, I'd prefer dragon steel to dragon fighting solely due to bulletproof and preferring steel types to fighting.