Since Monkey Punch's manga was published in 1967, I realized when I research that the first anime series and the comics were based on movies and TV shows at the time in the 1960s. So, I've decided to look it up on either the Japanese wikipedia or Lupin Central. Link of their website are down below. You can choose the story you like and I will see what ideas that can be put into a story. Most of stories takes places in the 1960s.
https://www.lupincentral.com/home/
Films
Lupin III: Dangerous Money (Danger Pays 1962)
Lupin III: The Mark of the Assassin (Branded to Kill 1967)
Lupin III: The Hairy Handgun (The Pistol That Sprouted Hair 1968)
Lupin III: The Sniper (Sun Above, Death Below 1968)
Lupin III: Epoch of Murder Madness (The Age of Assassins 1967)
Lupin III: Ninja Spy (Ninja, a Band of Assassins 1962)
Lupin III: The Great Rio Adventures (That Man from Rio 1964)
Lupin III: Eyes are Golden (Danger: Diabolik 1968)
Lupin III: Big Brain (The Brain 1969)
Lupin III: Obsession (Pierrot le Fo 1965)
Lupin III: Phoenix (Tokyo Drifter 1966)
Lupin III: Youthful Beast (Youth of the Beast 1963)
Lupin III: Deadly Task (A Colt Is My Passport 1967)
Lupin III: Auto Theft (Black Test Car 1962)
Lupin III: Down with the Wicked (Detective Bureau 2-3: Go to Hell Bastards! 1963)
Lupin III: The Italians (The Sicilian Clan 1969)
Lupin III: Honor Among Thieves (Adieu l'ami 1968)
Lupin III: Motorcycle Woman (The Girl on a Motorcycle 1968)
Lupin III: Away They Go (The Last Adventure 1967)
Lupin III: The Godson (Le Samouraï 1967)
Lupin III: The San Francisco Killers (Once a Thief 1965)
other ideas
TV Shows
The Avengers (British TV series)
The Saint (1962 TV series)
Danger Man
Doctor Who
Hawaii Five-0
Mannix
The Man From UNCLE
It Takes a Thief
The FBI
Columbo
Star Trek
The Outer Limits
The Fugitve
Mission: Impossible
The Prisoner
Man in a Suitcase
Dragnet 1967
Ironside
Here Comes Bronson
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Shadow Wolf (Lupin III 1960s x OC male thief)
FanfictionThe series is set in the 1960s where we met our lead protagonist, Shadow Wolf (real name Andrew Hoshino) is a master thief who specialize in robbing things that interest him. He is the head of The Wolf Clan, a group consists of thieves with differen...