YMMV / Diamond Brothers

• Complete Monster: While a very comedic and funny series, there are still some monstrous and serious villains to contrast:
  • South by Southeast: The assassin Charon, in truth Tim Diamond's girlfriend Charlotte Van Dam, is a deadly killer hired to kill an MI6 Russian Double Agent named Kusenov as a statement, as her employers know the hit is impossible. Instead, Charon lures Kusenov to England, killing several in the way before murdering an MI6 agent with ice skates. Charon rigs a bomb in an auction house where Kusenov wishes to buy a painting, intending to kill everyone in the room. Having been thwarted, Charon decides to spitefully murder Tim and his little brother Nick before establishing a permanent group of assassins to continue to profit from death and murder.
  • I Know What You Did Last Wednesday: The killer is Johnny Nadler, a former school friend of Tim's and a bitter loser who, following ten years after graduation of always coming in second, irrationally blames their former friends for their own failures and thus decided to murder them all. The killer starts off by murdering their best friend Rory McDougle by cutting him into multiple pieces, then lures the other seven to Rory's private island, which they had rigged with remote control traps, and began picking them off using methods that represented the school subject they had surpassed the killer in methods including poison, impaling and being crushed to death. Upon failing to make their final intended victim, Tim, fall to his death upon the jagged sea needles, the killer confronts Tim and Nick at gunpoint and admitted to have enjoyed their killing spree, before trying to murder them both.
• What Do You Mean, It's for Kids?: Despite being comedic children's stories, the books make absolutely no bones about the nature of the various criminals the brothers face, ie dangerous killers with no qualms about hurting children. The police aren't that much better, coming across as ruthless manipulative thugs who treat the Diamonds as expendable tools at best.

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