Darth Maul wears an earring in the film – but this wasn't planned. Actor Ray Park put on a small, silver earring before sitting down to do the Darth Maul makeup, and only noticed it later. But George Lucas said he liked it, so the earring stayed.
Non-sentient creatures were sometimes given piercings in order to attach a chain for behavioral control or to stop them from digging out the roots of cultivated plants. Darth Maul had a cartilage piercing in his left ear.
Maul shows signs of Antisocial Personality Disorder and Narcissistic Personality Disorder that were probably caused by a mix of genetics and circumstances.
Darth Maul was a Force-sensitive male Dathomirian Zabrak Dark Lord of the Sith who lived during the waning years of the Galactic Republic and during the early years of the reign of the Empire.
The boy was raised as Darth Maul, a name he carried throughout his life. In Legends, it was insinuated that he was born "Maul" before attaining the honor of the "Darth" title. Either way, it seems likely that viewers will never learn Maul's birth name since it wasn't important to his journey.
As far as I know, there is no Canon date of birth for Maul, but in Legends, he was born in 54 BBY. In canon, Maul was killed by Obi-Wan Kenobi on Tatooine during the year 2 BBY. If we use the Legends year of birth, then Maul would have been 52 years old when he died.
Regardless, based on the season 7 of The Clone Wars, and the fact that Darth Maul was aware of Anakin Skywalker's future and his role as the Chosen One, it is very likely that Darth Maul indeed feared Darth Vader to some extent, and preferred to avoid a direct confrontation with him, at least, on his own.
Chastened by his former Master on the principle of the Rule of Two, Maul abandoned his claim to the mantle of the Sith, focusing instead on building an empire of his own—the Crimson Dawn—by controlling the criminal underworld.
"Is it the Chosen One?" Maul asked. "He is," Kenobi replied. Maul looked up, the life fading from his eyes, and uttered his last words. "He will avenge us."
Dissecting the short fight, Obi-Wan used the same moves Qui-Gon Jinn did during their battle in The Phantom Menace, tricking Maul into executing the same parry he did before. However, instead of committing the fatal error his master did, Obi-Wan pivoted and hit Maul in the body, killing him.
According to our observations on Star Wars, Anakin presents a BPD pattern mainly related to emotional instability, impulsivity, and aggressiveness traits.
Maul had little choice in the matter. He was taken as a child by Sidious and cruelty was all he ever knew. He was still capable of caring for others like his brother or mother, but his rage and hatred fueled him till the day he died.
For some species, tattoos were part of their culture. For example, male Dathomirians, the Nightbrothers, such as the Sith Lord Darth Maul, had natural striping that they embellished with tattoos. Female Dathomirians, the Nightsisters, had more subtle tattoos that were in contrast to their pale skin.
In the now-abandoned Legends continuity, his birth name appeared to be Maul, with the title of "Darth" simply added to it when he was taken on as an apprentice by Darth Sidious.
Like his master, Darth Sidious, better known as Sheev Palpatine, Maul's main weakness was his overconfidence. In Luke Skywalker's confrontation with Palpatine during The Return of the Jedi, he tells the Emperor that his overconfidence is his weakness.
Ahsoka hesitated to team up with him, but reluctantly agreed. Maul later attacked Ahsoka, but the former was left to fight Kanan. Maul was shown to think little of Ahsoka, as he called her things such as "part-timer" and "Lady Tano" in mockery of her departure from the Jedi Order.
In a non-canon story from the pages of Star Wars Tales #9, Darth Maul was resurrected to fight Darth Vader to the death. Ultimately, Darth Vader was named the victor for a pitch-black reason: He hates himself more. In the main Star Wars canon, Darth Vader and Darth Maul never met, let alone fought.
During Star Wars: The Phantom Menace, Darth Maul had no clue about Anakin and dismissed him as a child following the Jedi around. But with Maul's return during the Clone Wars, he likely found out about Anakin through his obsession with Obi-Wan.
Sidious revealed to Maul that he did not intend to kill his former apprentice, as he still had use for Maul; it was Sidious' hope that Maul would lead the Sith to Mother Talzin, Maul's mother and the leader of the Nightsisters, so she could be eliminated as a potential threat to the eventual Sith rule of the galaxy.
During the battle, Anakin, who had been known as the Sith Lord Darth Vader, was redeemed by Luke and brought balance to the Force. However, the redemption cost Anakin his life, having been mortally wounded by the Emperor, Darth Sidious, while killing his former Master.
Maul was three years younger than his rival Obi-Wan, who was 55 years old when he killed the former Sith Lord at the tail-end of the Empire's rule. Comparatively, Ray Park, who's played Maul in live-action and performing motion capture for animation over the years, is 45 years old.
