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 not meant to be taken literally. To keep the flavor, a more appropriate translation might be "Eeney", "Meeney", "Miney" and "Moe".
The "itsu" monsters appear as men of various solid colors flying on a paper airplane. Each is sitting in a different position upon its airplane. "Soitsu" stands in a heroic pose, "Koitsu" stands on one hand in an acrobatic position, "Doitsu" sits cross-legged eating noodles, and "Aitsu" looks away from the view point in a philosophical gaze. Each is one of the primary colors (except "Soitsu"), though "Doitsu" is arguably tan. Also, their Attributes reflect their respective skin colors: blue "Koitsu" is WATER, red "Aitsu" is FIRE, green "Soitsu" is WIND and yellow/brown "Doitsu" is EARTH. The four also appear on a few cards such as "A-Team: Trap Disposal Unit", "Fossil Excavation", "Fossil Dig", and "Gravity Collapse".
| Attribute Spirits|
| Spirit of Flames|
| The Rock Spirit|
| Aqua Spirit|
| Garuda the Wind Spirit|
|Dracoslayers and Dracoverlords||Ignister Prominence||Amorphactor Pain||Dinoster Power||Majester Paladin|
| (Level 7) Dragon Rulers|
(Level 3 and 4) Younger Versions
(by set and effect)
|Prevent Trap activation||Invasion of Flames||Tactical Espionage Expert||Creeping Doom Manta||Eagle Eye|