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- All Your Powers Combined: During his tenure as a New Warrior, he took all his siblings' powers.
- Aloof Big Brother: On occasion, especially when he gets tired of his siblings' childishness or his Big Brother Instinct gets out of hand.
- Big Brother Instinct: It's not a heavily emphasized part of his character, but he does have a protective streak towards the others.
- Catch Phrase: "Gee!" in the early comics. It led to his superhero codename "G," later expanded to "Zero-G."
- Gravity Master: The power he started out with.
- Mr. Fanservice: The Marvel Legacy one-shot has him shirtless for several panels, revealing his Heroic Build.
- What the Hell, Hero?: The reaction of his siblings when he took their powers.
- Adaptation Dye-Job: In the original series she's described as "strawberry blonde," but — probably thanks to the limited color techiques of comics in the 1980s — generally comes across more as a redhead. The all-ages series consequently makes her a redhead.
- Bare Your Midriff: For some reason, her costume suddenly does this as a teenager.
- Bookworm: She loves to read. This trait was most prominent in the early parts of the original series, but shows up on occasion in her later appearances too.
- Characterization Marches On: She went from being the one that studied the most to wanting to be an actress.
- Cool Big Sis: Katie (and to some extent Jack) certainly thinks so.
- Super Speed: Her power that leaves behind a rainbow streak. Quit snickering, bronies.
- Annoying Younger Sibling: To Alex and Julie. To Katie, he's an annoying older sibling.
- Bratty Half-Pint: The clearest example in the series. If one of the Power siblings acts out, causes trouble or does something thoughtlessly mean, it's usually Jack. Unlike many examples of this trope, though, he has a lot of moments where he feels bad afterwards and tries to make amends.
- Deadpan Snarker: His snark isn't always the most sophisticated, but he tries.
- Hollywood Density: His power to either shrink to the size of an ant to turning into a cloud.
- Jerk with a Heart of Gold: He's a grouchy brat who can be a real pain in the neck to everyone, but he's also genuinely heroic and will go out of his way to help those in need.
- Shapeshifting Excludes Clothing: His suit is designed to turn into a cloud with him. If he doesn't have it on, he'll end up naked.
- All Girls Like Ponies: This was one of her character traits in the All-Ages series. She even rode on Beta Ray Bill.
- Bratty Half-Pint: By no means as much as Jack... but she definitely has her moments.
- Cheerful Child: When she isn't being a Bratty Half-Pint, she's very clearly the sweetest, friendliest and most upbeat of the Power siblings.
- Cute Bruiser: With the Energizer powers, she packs a serious wallop, to the point where in the early parts of the original series she was the one who tended to get knocked out or made to sleep as a way of Holding Back the Phlebotinum — otherwise she'd defeat the bad guys in ten seconds flat.
- Annoying Younger Sibling: When in Bratty Half-Pint mode.
- Hair of Gold, Heart of Gold: In the original series she was strawberry blonde like Julie, though the all-ages series turned her into a regular blonde like Alex, and the 616 incarnation followed suit.
- Adaptational Wimp: Zig-Zagged. While he does still have his reality warping powers, he never uses them.
- Catch Phrase: "Oboy! My favorite!" Said about pretty much any kind of food.
- Vitriolic Best Buds: With Katie. The "vitriolic" part was more pronounced in the beginning, with the "best buds" part getting more attention later on.
- "Well Done, Son!" Guy: Believes that his father cares more about his career as a diplomat than him. Not helped by the fact that Yrik has a very unapologetic "Not Now, Kiddo" attitude regarding children contributing to important issues. They eventually start to work things out and bond, though not without a few bumps along the way.
Friday the Smartship
- Blob Monster: After being pushed into Limbo, N'astirh "chewed away" his humanity, turning him into a grotesque, barely human mass of mobile chalk-white slime that looked like animate semi-liquid fat.
- Cephalothorax: In his demon form, he's basically an oversized, demonic head with limbs jutting out of it.
- Deal with the Devil: More literally than most; he tries to bargain with N'astirh to sell him mutant children. It goes disastrously wrong for him when the New Mutants and the Power Pack team up to thwart his plan and end up throwing him into Limbo, where N'astirh turns him into a demon.
- Fantastic Racism: In the grand tradition of Marvel Comics, Mr. Carmody hates mutants with a passion. He hates them so much that he tried to make a Deal with the Devil with the lives of mutant children.
- Freudian Excuse: At the end of the three-part Inferno tie-in, whilst ranting at the Power Pack for the love their parents show them, he inadvertently hints that he suffered from emotionally Abusive Parents himself, which is part of his reason for hating the Power Pack.
- Hypocrite: Claims to be determined to fight mutants to protect the human race, but after becoming a demon, he also readily kills humans, usually for considering them "disgraces to the human race".