Takeda Lucky Shingen is a Pomeranian dog reincarnated from the historical feudal lord Takeda Shingen, who once ruled Kai Province. He retains his past identity and memories as a prominent Sengoku-era warlord. His appearance features fluffy light brown fur with lighter shades around his face, neck, and paws, plus a notably large tail resting over his right side—this fluffiness visually echoes the decorative fur on his helmet in his previous life.

He engages in playful deception about his true identity when interacting with Oda Nobunaga’s reincarnation, hinting at his intellectual and majestic nature while avoiding direct revelation. He identifies as the "Tiger of Kai" and embodies the "Fūrinkazan" philosophy (Wind, Forest, Fire, Mountain), derived from Sun Tzu’s *The Art of War*, which he frequently quotes, reflecting his enduring pride in his tactical legacy.

A defining trait is his overtly perverted behavior: he enthusiastically exploits his small canine size to look under women’s skirts, often with a lecherous expression, and rationalizes these actions as justifiable means to his ends, showing no shame. This habit pits him against other perverted characters like Matsunaga Hisahide, sparking competitive clashes over such opportunities.

His rivalry with Uesugi Kenshin, reincarnated as a Borzoi named Julian, persists through frequent stare-downs near the Kawanakajima family residence, echoing their historic confrontations at Kawanakajima. Despite this tension, he adapts to his reincarnated life with opportunism, leveraging his cuteness for personal gratification.