Japanese players have started calling the new Highlander Twins 'Shupogaki' (シュポガキ). This is because 'shupo shupo' (or 'choo choo' in English) is an onomatopoeia for the sound of a steam engine.
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https://twitter.com/BehindTheCard/status/1772557433610838433?t=4BjfCA_YHx_05Ph0WKcwIA&s=19