- "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".
- "Aitsu" is featured on the artwork of the following cards: