YMMV / The World's Finest Assassin

• Alternative Character Interpretation: After Lugh returns from his time posing as the son of a merchant family, an endeavour he had great success in, his father Cian asks him if instead of continuing the Tuathe De line as an assassin he'd like to remain a merchant, to which Lugh refuses and remains adamant on continuing the family business. Was this Cian legitimately being concerned for Lugh's potential well-being and safety in their line of work and wondering if he'd be happier doing something over than killing people? Or was it a Secret Test of Character that truly serves as Lugh's final test before taking on assassinations.
• Angst? What Angst?: Between Episodes 6 and 7, Maha goes from a traumatized orphan who's seen the effects of sexual abuse of her friends to falling in love with Lugh, the man who bought her off the slavers. The lack of time for this shift in character (as opposed to Tarte's 2 years of living with Lugh) is a point of criticism.
• Anti-Climax Boss: Setanta. He was setup as The Dreaded, and due to massive strength, a Healing Factor, and a divine spear that could be tossed, doing enough damage to break through several castle walls, he seems like he'd be a really tough boss for Lugh. Instead he dies in the first attack after Lugh launches a Kill Sat against him.
• Awesome Music: "Dark Seeks Light" is fire.
• Big-Lipped Alligator Moment: The rap battle between the goddess and a DJ in Episode 7 seems completely out of place for an anime like this.
• Catharsis Factor: The end of Episode 6. After having to bear watching Maha and her friends being abused by those disgusting Human Traffickers, many viewers are deeply elated when Lugh intervenes, saving the girls and getting their oppressors arrested.
• Complete Monster (anime):
  • "Quantum of Trust": Marquess Collide regularly hosts slave auctions inside her mansion. Having villages raided to secure young girls, Collide sells them as sex slaves to high-paying bidders. When Lugh Tuatha Dé and his team bust her latest auction, Collide leaves her servants and clients behind in an attempt to save her own skin.
  • "Residence of Girls": Mr. Torran and Lloyd are a pair of disgusting pimps who force underage girls into prostitution. Running the Torran Orphanage, Lloyd regularly kidnaps young girls so that he and Torran can pimp them out to their acquaintances. With Lloyd forcing the girls to perform slave labor around the orphanage, Torran and Lloyd occasionally rape the girls as well to savor the goods. Doing this to Maha and friends for over two years, Torran looks forward to when Maha comes of age so that he can rape and prostitute her, and as Lugh rescues the girls, Lloyd threatens Maha with raping her should he leave him.
• Funny Moments: Any time we see the Goddess giving her quest to one of the numerous reincarnation candidates.
• Harsher in Hindsight: Episode 7 involves a recently deceased DJ reincarnated in another world. Not long after, rapper Young Dolph was shot and killed in Memphis.
• Heartwarming Moments:
  • The Tuatha Dé family as a whole. They may be deadly killers but it's made clear that they value their humanity as much as their jobs which is why Lugh's parents raised him with love and compassion.
  • The end of Episode 6 has Maha and her friends finally freed from their oppressive captors. Then in Episode 7, it's revealed that the girls now run the operations at Lugh's business — a stark contrast to their impoverished lifestyle when they were kids.
• Magnificent Bastard (anime): Cian Tuatha Dé, Lugh’s loving father, is the head of the House of Tuatha Dé, and an incredible assassin in his own right who made Lugh into the skilled killer he is today. Disguising his hits by posing as the Alvan Kingdom’s medical expert, Cian uses a wide variety of tactics, disguises, and clever traps to kill his targets while not getting caught, all while believing that murder is necessary to protect his kingdom. Raising Lugh to be his heir, Cian has him kill death row inmates so that he won't grow hesitant over killing people, while letting him know that he will be raised not as a weapon, but as a person, who must possess human values to be a better killer. Cian is even able to get the experienced Lugh into the position of aristocrat by having him injure the supposed runner-up as a test of strength. Getting Lugh to pose as a successful merchant to get closer to his targets and privately build a team of assassins, Cian ultimately does what he can to give Lugh the life he thinks he deserves, while doing what he must to assist him in his plan to defeat the Hero.
• Nightmare Fuel:
  • The Tuatha De nobility is conditioned to be an assassin and to kill at an early, young age. At least that's what happens to Lugh, is because it's from the viewpoint of an old assassin, reincarnated. One could wonder if it's someone else, especially how the family has a dead first daughter and it's implied that the daughter died in line of her task...
  • Episode 6 features a horrific sex-trafficking ring run by depraved, pedophilic rapists who even treat their victim poorly by hitting them and serving rotten stocks. The only reason things turn out somewhat okay for the girls in that episode is because of Lugh (then posing as Illig Balor) and Tarte.
  • At the end of Episode 10 and the beginning of Episode 11, before the immediate Bait-and-Switch into Faking the Dead, the head of the Tuatha De nobility immediately ordered an assassination of an innocent teenager in a straight, stoic manner. Even Lugh, reincarnated from a 70 year old highly experienced and considered the best in the world assassin, is startled.
• Squick: Some may consider the idea of a man who's mentally 70 years old pursuing a teenager to spoil the romance the creators are going for.