Secret Bambino

Shadow
Twisted Shopping District	Slipping Hablerie - Shadow Yosuke
Yukiko's Castle	Lying Hablerie - Calm Pesce - Trance Twins - Black Raven - Magic Hand - Secret Bambino - Positive King - Bronze Dice - Avenger Knight - Burning Beetle - Phantom Mage - Heat Balance - Magical Magus - Laughing Table - Shadow Chie - Avenger Knight - Prince Charming - Shadow Yukiko - Contrarian King
Steamy Bathhouse	Rainy Brothers - Bribed Fuzz - Autonomic Basalt - Monopolizing Cupid - Cloudgirl Pot - Pursuing Pesce - Daring Gigas - Nizam Beast - Phantom Master - Iron Dice - Vicious Raven - Dancing Hand - Egotistical King - Selfish Basalt - Rainy Sisters 4 - Tranquil Idol - Wondrous Magus - Killer Twins - Grave Beetle - Crying Table - Wealth Hand - Daring Gigas - Nice Guy - Tough Guy - Shadow Kanji - Intolerant Officer
Marukyu Striptease	Rainy Sister - Creation Relic - Soul Dancer - Death Seeker - Miss Gene - Rain Wheel - Persistent Fuzz - Sonic Raven - Idle Basalt - Venus Eagle - Liberating Idol - Rainy Brother 3 - Killing Hand - Enslaved Beast - Forgotten Hablerie - Rain Leg Musha - Blooming Bambino - Adamant Beetle - Silver Dice - Large Basalt - Champion Knight - Sky Balance - Mighty Cyclops - Arcane Turret - Treasure Hand - Amorous Snake - Shadow Rise - Shadow Teddie - Momentary Child

Bambino is Italian for "little boy". Someone could argue this is actually a reference about bastards sons of kings, that were not that uncommon in the middle ages. That can be further backed up, since this enemy is summoned by Positive King.