• Aitsu, Koitsu, Soitsu and Doitsu are from Sexy Parodius, a Konami game that parodies Gradius.
    • When translated, the names "Koitsu", "Soitsu", "Aitsu" and "Doitsu" mean "This Guy", "That Guy", "That Other Guy" and "Which Guy?" respectively. The names are whimsical, and are not meant to be taken literally. To keep the flavor, an appropriate translation might be "Eeney", "Meeney", "Miney", and "Moe".
    • Coincidentally, "Doitsu" is also Japanese for "Germany".
  • This is a toned-down version of Koitsu.
    • It could be an upgraded version depending on how you look at it. Koitsu and Aitsu need tributes while Doitsu and Soitsu do not.

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