Mister X (Lupin III)

Mister X is a minor antagonist from the first Lupin III series and the main one alongside Kyōsuke Mamō of the OVA Is Lupin Still Burning?
Is Lupin Burning?
Fujiko spies on Mister X at Hotel Miracle when he is talking of plans to kill Lupin III to the people he plans to have Lupin die infront of. X catches onto her spying when he turns the light off and has her caught when she tries to warn Lupin.
Mister X greets her while she was strapped to a table where he announces plans to wager on his death at a race track he and his fellows constructed alongside the cars Scorpion manufactured and disguised for the race. In addition to trying to kill Lupin, X is planning to rid the world of the Lupin Empire's symbol so he can crush his rivals.
As he does this, Mister X reveals he had a hundred cameras set up while he intends to subject Fujiko Mine to a slow death while she watches. The people working at the track, who were really underlings of Mister X, activate a trap to try and kill Lupin while Mister X subjects Fujiko to a machine that pulls her clothes off with small hands. However Lupin overcomes the oil trap and a set of logs in the road.
After Lupin has a disguised Jigen take his place in the race, he impersonates a plumber to infiltrate the hotel Mister X is based at to save Fujiko who was was subjected to the machine designed to pull apart her clothes and molest/tickle her.
After the toilet water floods the room thanks to Lupin's machinations, Lupin himself confronts Mister X and declares his intent to put the Scorpion group out of business and frees Fujiko from the machine and races back to the race after dropping off Fujiko.
Having been humiliated, Mister X drives to the race track where the trophy was revealed to be a bomb intended to kill Lupin which he throws to the commissioner of the race and several of his fellow goons, leading to them being caught in the blast and Lupin. Believing Lupin is burning to death at the track, Mister X laughs before he passes out.
Is Lupin Still Burning?
Initially believed to be dead, Mr. X is still revealed to be alive and has become partners with Kyōsuke Mamō who was responsible for making the gold statue they stole. When Lupin enters the new race, he finds a series of traps he manages to avoid.
When Fujiko finds the missing statue at a mansion it turns out to be a placebo Mr. X setup and captures her where he uses a new version of the machine he previously used on her to try and molest her, this time he had no interest in information and wanted her to see Lupin disappear from existence with the aid of Kyōsuke Mamō's new time machine.
As Kyōsuke Mamō was explaining its functions, Mr. X continues to make Fujiko suffer when Kyōsuke makes Lupin dissappear into the past, leaving them with one less pest in their way. As Mister X continues to use his machine to make Fujiko suffer, it suddenly malfunctions and blows up.
Kyōsuke Mamō then explains to the two that as things are now, nothing will go the way Lupin wishes. Mister X points out that while Pycal never succeeded in killing Lupin, they still have other chances at killing him with Fujiko being forced to watch while continuing to suffer simultaneously.
This resulted in Jigen being shot by Stoneman as a result of Lupin being sent into the past, resulting in him not being an ally for Lupin. As Lupin is continued to be thrown through time, Mister X subjects Fujiko to a similar machine only with lips instead of hands, torturing her even further.
When circumstances suddenly cause Fujiko to vannish from the present, Kyōsuke Mamō tells him that the past was changed along with the relationship of Fujiko and Lupin which leaves leaves Mister X grieving at the loss of a chance to completely molest Fujiko with the new machine.
The changes in history also resulted in Goemon becoming an assassin for Momochi and Zenigata not recognizing Lupin. Kyōsuke Mamō brings Lupin to Mister X only the latter to find that Lupin switched places with Kyōsuke and put time back the way it was before they've meddled with it.
Kyōsuke gets his clothes cut off again and finds himself and Mister X trapped in the dinosaur age.