Emma Frost is a force to be reckoned with. She has screwed over many characters in the Marvel Universe, so in a final showdown, let's pick Emma Frost's greatest victim!!!
Adrienne Frost
Emma murdered her sister Adrienne with a gun after she planted a bomb at the Generation X school and killed one of her students Synch. She took all of Adrienne's money and only regretted that she didn't kill her sister sooner.
Astrid Bloom
Astrid taught Emma many tricks of telepathy but betrayed Emma by mind-controlling her college friends and orchestrating a grand plot to show humans couldn't be trusted. Emma went one-on-one with Astrid and left her comatose with a bleeding nose. ... We haven't heard anything about Astrid since!
Blips of Inhumans
Emma was angry that the Inhumans unleashed mists that killed mutants and her ex-boyfriend, Cyclops, so she launched an attach that killed hundreds of Inhumans who were floating in the sky in a blip ....
Butter Rum
Emma murdered Firestar's pet horse, Butter Rum, in order to teach Firestar a lesson about responsibility. In fairness Emma did evacuate all the horses in the barn before she set it on fire and finished the burning Butter Rum off with a cut to his life force via telepathy. Merciful or vicious?!
Cassandra Nova
After Cassandra Nova slaughtered 16 million mutants she went after the X-Men and tried to kill them. After having an epiphany like Paul on the road to Damascus, Emma rescued to the X-Men
and snapped Cassandra Nova's neck. With the help of Professor X and Jean, she reverted Nova to the intelligence of a baby in a catatonic state....
Cyclops
Some X-Men (and fans) accuse Emma of manipulating Cyclops and turning the X-Men into cold-hearted killers to defend the very few mutants left on Earth. She helped destroy his 30-year marriage and kissed over the grave of Jean Grey, his ex-wife who died in his arms! Later with no one to save him, Cyclops died by the Terrigan Mist, and the X-Men are in a public relations rut due to Emma's actions against the Inhumans.
Firestar
Firestar lived a normal teenage life until Emma convinced Firestar's father to have his daughter join the Massachusetts Academy. Emma put her through strict training in hopes to make her the perfect assassin that would kill Selene. The plan backfired and upon Firestar learning that Emma killed her pet horse, she blew up the school's gym compounds and ran away, horrified and traumatized by Emma's abuse.
Hellions
Emma loved the Hellions and trained them dearly, but they were killed when Trevor Fitzroy unleashed Sentinels on them. Her fault or not, it's still sad and they're still victims!
Jean Grey
With her expertise in electrical engineering and telepathy, Emma created a gun-like device that enabled Mastermind to project his illusions into the mind of Jean Grey. These illusions sent Jean Grey spiraling into the Dark Phoenix, and off she went and ate a planet full of billions of people. Oops! Later, Emma involved herself Jean and Scott's marriage. After Jean died, Emma took the place of Jean and became headmistress of the X-Men and also became Cyclops' new girlfriend.
Kimura
After Kimura terrorized X-23 and turned her into a child assassin, she was going to finish her off and kill her with a special bullet. Emma saved X-23 just in time and interrupted Kimura and erased every happy memory Kimura ever had. Kimura probably desrved it, but that is some Black Mirror-level horror..
Kitty Pryde
Like Firestar, Kitty Pryde was terrorized by Emma when she also tried recruiting the teenage mutant into the X-Men. Kitty watched Emma cage and capture the X-Men with no remorse, and she was traumatized forever...
Sebastian Shaw
Emma had Sebastian Shaw for a fool! He thought she loved him, but she was only using him to cement her standing in the world. Later she erased all his memories and left him as a homeless person to fend for himself.