Best Match comes from Kamen Rider Build, the 2017 Japanese tokusatsu series in the long-running Kamen Rider franchise. In the show the Build Driver announces Best Match when the hero inserts a compatible pair of Fullbottles, signalling a stronger form before a transformation. Clips of the belt voice circulated among tokusatsu fans on video and soundboard sites, where the short, enthusiastic shout became a reusable reaction for anything that fits together perfectly. Its toy-like delivery keeps it popular for edits far beyond the original fandom.