- Can't Un-Hear It: Fans tend to hear the voice of Carl Lumbly whenever they are reading J'onn's lines.
- Complete Monster:
- Benn Blanx. See Justice League of America.
- J'onn's own twin brother, Ma'alefa'ak J'onzz—or Malefic—had his natural psychic powers stripped by his own people by abusing his telepathic powers, using them to cruelly Mind Rape J'onzz's wife. Out of petty spite, Malefic engineered a fatal psychic plague among his people, causing whatever Martian that used their psychic powers to horribly burn and die as a result and singlehandedly destroying almost his entire race as a result. Pursuing his brother J'onn to Earth in a single-minded crusade to end his brother's life and complete his genocide, Malefic tried various times to destroy his brother and all those close to him, murdering the partner of his human identity, Karen Smith, and trying to mentally drive his own brother to suicide through a remnant of himself before his final death.
- Fashion-Victim Villain:
- Both Mr. V (who wore a business suit jacket, a T-shirt, and slacks) and Commander Blanx (in his green and sickly orange get up).
- The Human Flame's oft-mocked costume features what appear to be flaming nipples.
- Funny Moments:
- To meet with Bruce Wayne and Clark Kent in Japan, J'onn utilizes one of his aliases, a female Japanese reporter named Rei Hino. Batman recognizes him anyway, noting in part that the name is a dead giveaway.
- Never get between J'onn and his Chocos. He'll actually Hulk Out on your ass. Just ask Booster and Beetle (they went out of their way to deprive J'onn of his cookies in a prank that went horribly, horribly wrong).
- Heartwarming Moment:
- When Miss Martian's teammates learned she was actually a White Martian, they still came to accept her.
- J'onn might have some doubts in humanity sometimes, but one of the strongest themes throughout his publication is a quiet gratefulness and admiration for the people who have adopted him as their hero. He's died multiple times in canon for the sake of humanity.
- Miss Martian is a kind, gentle, compassionate girl, unlike most of her kind. When she takes the form of a Green Martian to be accepted because of what her people have done, Martian Manhunter finds out, but he accepts her despite their peoples histories which makes it all the more sweeter.
- Newer Than They Think:
- Not many people know this, but Mars was fully populated in the Silver Age. The concept of J'onn being the last Martian didn't come until later.
- Likewise, for most of his early existence, his green humanoid form was his true form; it wasn't until the 1988 miniseries by J.M. DeMatteis that established it as a compromise between his human disguise and his more alien-looking true form to make himself seem less frightening.
- So Bad, It's Good: Back in 1959, there was a story in which J'onn J'onzz goes up against a foe called the Human Flame... who was a schlub named Mike who built a "crime suit" that shot electric bolts and fire out of little spouts on the chest. That's right: Flaming Shock-Nipples of Crime! He dropped off the face of the earth for 50 years and was eventually brought back as an Ineffectual Sympathetic Villain in Final Crisis.
- Uncanny Valley: J'onn's almost-but-not-quite human shape sometimes disconcerts people. (And this was the form he created to avoid scaring people!)
YMMV / Martian Manhunter