Johnny has "Flame On!", Ben has "It's Clobberin' Time!", but as far as I know

[Alan2099]

He doesn't say it as much as he used to, but Shatterstar used to say "Za's Vid!" and "Fekt" a lot.

Solo, a rather minor Spider-man character that used to be a lot more prominent in the '90s also used to announce "Where Solo lives, Terror dies!"

Fool Killer actually had a couple of catchphrases. My favorite being "Live a Poem, or die a fool!"

[ARkadelphia]

I’m yesterday’s Iron Man issue, Tony Stark rips off the Beast, saying “oh my stars and garters”.

[ARkadelphia]

“By the white wolf!” - Colossus

[shooshoomanjoe]

I always got annoyed by Psylocke's catchphrase

[Riv86672]

Personally, this one is still an All-Time Favorite

^^^Is this the only catchphrase to ever inspire a heroic identity?

[K7P5V]

I know this was just a juvenile prank that Rick pulled on Captain Marvel, but I've always enjoyed this one...

O-WHA... TAGOO... SIAM!




As for any valid catchphrases that belong to Genny, a personal favorite would be...

Grozit!

[Digifiend]

I always got annoyed by Psylocke's catchphrase

Well, given that Psylocke has since changed identity (it's Kwannon now, not Betsy who became Captain Britain), I assume this one won't be used any more.

[ARkadelphia]

Hulk Smash!

[ARkadelphia]

My fists hit like Thor’s hammer - Wonder Man

[Sutekh]

Yep - Kamala uses that in the same context as Johnny's "Flame On!".

Others at Marvel include:

"Oh my stars and garters!" - Beast.
"Blue Blazes!" - Richard Rider, Nova.
"Suffering Shad!" - Namorita.
"Imperius Rex!" - Namor the Sub-Mariner.
"Avengers Assemble!", "To Me My X-Men!", "Champions Charge!" - all used as battle cries by the team leaders. Interestingly, while the Teen Titans have an equivalent, "Titans Together!", the JLA doesn't.
"By Odin's Beard!" - Thor.
"You wouldn't like me when I'm angry" - Bruce Banner.
"Hulk Smash!" - when he does get angry!
"I'm the best there is at what I do, and what I do isn't very nice" - Wolverine.
"With Great Power There Must Come Great Responsibility" - Peter Parker, Spider-Man.
"Good is not a thing you are, it's a thing you do" - another famous Kamala Khan quote (it's her equivalent to Spidey's great power line).

"The focused totality of my telepathic powers..." - Psylocke

"Ahm nigh-invulnerable when ahm blastin'!" - Cannonball

"With great power..." - Spider-Man

"Get your War on!" - Speedball, trying out a battle cry for the New Warriors
"Shut up, Robbie!" - the rest of the New Warriors

[ChrisIII]

I think Englehart gave him "Fantastic Four Forward!" in one later issue of his run when the old team finally got back together. It didn't stick of course.

[Mister Mets]

I think for Reed it's "I've been thinking."

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[Mister Mets]

For Dr. Doom, it is simple "I. Doom."

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[Triniking1234]

Sue has a battle cry but we can't see it.