- Arc Fatigue: The Insane Genis-Vell arc in Peter David's run. Initially, it was supposed to run for 6 issues as part of the U-Decide contest but when Peter David won the contest, he kept the arc going and it took almost a year and a half for it to be resolved. After awhile, people stopped caring about Genis and grew to dislike him and the direction the book was going, leading to it being cancelled and Issue 25 reflecting on this.
- Broken Base: Over which Captain Marvel — if any — was a worthy successor to Mar-Vell. Monica, Genis-Vell, Phyla-Vell, Noh-Varr or Carol?
- Crazy Awesome: Insane Genis-Vell for some. After losing his mind to his Cosmic Awareness, he killed a sociopath hiding in plain sight by making him explode, conquered entire races by himself, punched his fathers former mentor to death and looted his corpse for his armor, entered Shiar, and later Skrull and Kree warships, and curbstomped them, came back from the dead, destroyed the universe by chaining and crushing Eternity to death and brought it back after shooting Entropy in the face.
- Complete Monster:
- Walker, or He Who Walks Beyond Life and Death Like a Colossus, from the May 2001 and June 2001 issues, was a death god of a distant galaxy who, seeking to impress Mistress Death, murdered every soul in his galaxy and entrapped them within him, in horrible torment. When Death was repulsed and turned from Walker, he decided to murder her out of spite, hunting her to Earth where he attempts to get her attention by killing people close to the current host of death, Marlo Chandler, even resorting to Cold-Blooded Torture to draw her out. When Genis-Vell joined forces with Thanos himself to stop him and Death refuses to show herself at first, Walker reveals he will happily take the Earth apart "molecule by molecule", willing to annihilate everything in his path solely for being spurned by the object of his obsession.
- Mar-Vell's first archenemy Colonel Yon-Rogg falls into this as well, as he was perfectly happy to let one of the Kree's greatest war heroes die and their mission fail out of petty jealousy. He not only coveted Mar-Vell's lover Una, he also hated that Mar-Vell, a mere captain, was more respected and more decorated than he was. He was directly responsible for many of Mar-Vell's early difficulties, culminating in a botched assassination that turned into a pitched battle that saw the death of Una. When he finally met his death being crushed under rubble after being revealed as a traitor to the Kree, no one mourned him.
- Growing the Beard: The first few issues of Captain Mar-Vell's adventures were considered aimless and lackluster. When Jim Starlin took over and made the character truly cosmic —up to and including the first major arc of Thanos and the Cosmic Cube, and Mar-Vell attaining cosmic awareness to combat him— he became one of the most popular and influential characters in Marvel's roster.
- Harsher in Hindsight: The incident of Captain Mar-Vell closing off a leaking container of nerve gas seemed to have been resolved satisfactorily when a friend arrived to administer the antidote, but it turned out later that the gas was carcinogenic which result in incurable cancer that later killed him. So when the cover of Captain Marvel #34 introduced the brand-new villain Nitro as "the man who killed Captain Marvel'' (by blowing himself up and thus damaging the gas canister), it was an accurate description, just with a delayed reaction.
- Heartwarming Moments: For as much of a Tear Jerker as it was, The Death of Captain Marvel was absolutely littered with these, up to and including the Skrull Empire, bitter enemies of both Mar-Vell's people the Kree and his adopted homeworld of Earth, sending a general to visit him on his death bed in order to present him with a medal, commending him for his bravery and military accomplishments that he performed as his enemy. Even Thanos pays Mar-Vell one last visit to honor him (in his own way) before his death.
- Ho Yay: Phyla-Vell and Moondragon. Also Moondragon and Rick Jones' wife Marlo.
- The latter was so poorly received it was retconned as Marlo being overwhelmed by Moondragon's psychic power.
- I Am Not Shazam: Before the New 52 was set into place, a lot of confusion between DC's Captain Marvel and Marvel's Captain Marvel permeated discussions about the characters. Of course, once the Trope Namer had his name officially changed to Shazam in the Continuity Reboot, Marvel gained exclusive rights to the title.
- Moment of Awesome: For as tragic as his death was, one awesome moment came of it. While the Kree turned their back on Mar, the Skrulls dispatched one of their top generals to present him the highest decoration in the Skrull Empire for being such a Worthy Opponent to them.
- My Real Daddy: Jim Starlin for Mar-Vell and Peter David for Genis-Vell.
- Romantic Plot Tumor: The Una/Mar-Vell/Carol Danvers love triangle was... awkward to say the least, even by Silver Age standards.
- Tear Jerker: The Death Of Captain Marvel, full stop.
- Unfortunate Implications: Following in line with other legacy heroes, Marvel received praise for their decision to "promote" Carol Danvers into being the new Captain Marvel. This eventually lead to criticism of Marvel putting Monica Rambeau, a Black woman who once had the title, out of focus to prop up Carol.
- Unintentionally Unsympathetic: The epilogue of the Odyssey arc in Peter Davids run forced Genis into having to murder his son in the crib since he will someday grow up to be a mass murdering monster
except a good chunk of Ely-Vell going evil rests on Genis shoulders. In the future, Genis future self wasnt present during the invasion of the Earth and spent some time sleeping on the job, leading to the Earth being invaded. Its not helped when Genis disappears to go forward in time to help Marlo, not realizing that he left Ely behind without a father for centuries. Ely even calls Genis on this, saying he cant just up and disappear to go help people centuries at a time. Due to Genis being absent for most of Elys life, this naturally lead to Ely finding a way to fill the vacuum his father behind with The Magus. None of that justifies the Moral Event Horizon Ely committed by killing billions of people to free his newfound master but Genis is completely to blame for what took place with his son. Had Genis not ignored his own son, he might not have needed to kill him at all.
- Its made worse that Genis didnt even need to necessarily kill his son. In the Odyssey arcs ending, Genis shows he can influence the timeline with a decision he will make in the future which he uses to someday murder his future son. This a power that could potentially be used to shape a better future for himself and his family but instead of resolving to do better, Genis instead decides to murder Ely in the crib. This ultimately makes Genis a bit of a hypocrite since Genis did far worse when he went insane. Its possible The Magus would have potentially done worse than him but Elys own actions did not come anywhere close to what Genis did when he destroyed the universe and later restored it. It brings to mind what if Mar-Vell knew he would someday have a son that would commit so many evil actions even despite the possibility that hell try and redeem himself. If Genis got a chance to redeem himself, why is it that Ely doesnt get one?
- The Woobie: Genis whole life seems to be centered on this. He was aged to adulthood so hed be strong enough to face his enemies (which cost him much needed maturity and experience), he accidentally detonated a Nega-Bomb which killed billions after trying to deactivate it in a set up by the Kree and Shi'ar, felt the Silver Surfer, his mentor die and used all his power to revive him when finding his corpse, fought his mentor when he believed Norrin was letting the people of Zenn-La perish until he was trapped in his surfboard and saw Zenn-La fade away into nothingness and was forced to confront the reanimated corpse of his father who killed his mother. This is all before he became Captain Marvel where his problems just got so much worse.
YMMV / Captain Mar-Vell