Karen is a character appearing in Pokémon Adventures, who is a member of the Elite Four and was an executive of Team Rocket in the Johto region.
Karen is identical in appearance to her game counterpart. When she becomes a member of the Johto Elite Four, Karen's appearance is rectified to match her revamped game outfit. She also wears one of the masks shared by all of the Masked Man's subordinates.
Karen has a cruel personality, as shown when she willingly sided with the Masked Man, but under the guise that they were kidnapped alongside the others. She is shown to despise Green for her ornithophobia (fear of birds).
Karen was willingly recruited alongside Will into the Masked Man's service. All of Masked Man's children were chosen, based on their gender, age, talents and birth place. Together, along with Sham and Carl, watched as Ho-Oh took Green to the Masked Man, who placed the mask on her and took Green in his group by force. Will and Karen trained together, per the Masked Man's proposal, and all were to wear masks.
Later, when Green and Silver attempted to escape from the Masked Man's base, Karen and the other associates intercepted their movements in the air duct. Karen attacked with her Houndoom, as Silver sprawled from the combined attacks. Green severed a cooling vent, as the billowing smoke obscured their movements from Karen and the others. When Karen and the others pursued them, they found themselves faced with the gradually expanding body of Green's Jigglypuff.
Karen appeared at Ilex Forest to confront Green alongside Will. As Green prepares to attack Karen with her Snubbull, she used her Umbreon to incapacitate it. Karen revealed that the two of them have been instructed to guard the shrine from any intruders, and that the Masked Man would gain the ability to manipulate time. When Karen summoned Ho-Oh onto the scene, she also grabbed Green's hand and forced her to cower in fear.
She attempted to use it to force Green to hand over the two feathers. Karen knocked her onto the ground, as Will revealed to Green that Silver was defeated easily by the two of them. As Green ran over to Silver and prevented him from falling, Karen asked whether their touching moment has ended. Enraged, Green stood her ground against the advancing Ho-Oh, much to Karen and Will's surprise. Karen ordered Ho-Oh to circle back and attack Green, but the attack was countered by Zapdos, Moltres and Articuno. She instantly took to Ho-Oh's back, as Will does the same with Lugia. Karen then attacks the three birds with Ho-Oh, as the opposing factions engage in battle with one another.
When Red and Green arrived on the scene, they assisted Green in her battle against Karen and Will. Before long, Green noticed that Karen was no longer riding atop Ho-Oh, to which Karen revealed that she was clinging onto Moltres' back the entire time. Once Green's Bull attacked her Umbreon Karen then used her Umbreon's Moonlight to heal itself, then send Green's Snubbull hurtling back to Green. She mocked Green's current situation, who lurches precariously off Moltres' back. Will, however, lost against Silver and told Karen he would retreat and abandon the Masked Man.
After the battle, Karen rescues an unconscious Will, flying away with aid from her two Murkrow. She noted how powerful those trainers were when united, but wondered what she and Will would do, after they abandoned the Masked Man. They were then approached by Koga and Bruno, who invited Karen and Will to join their organisation.
HeartGold & SoulSilver arc
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|Umbreon was initially seen as a Eevee during the flashback where Green and Silver attempted to escape from the Masked Man's base. It was ordered by Karen to attack the escaping pair, leaving Silver grievously injured. It later appeared as a fully evolved Umbreon at the Pokéathlon Dome alongside Karen and the other Elite Four during the HeartGold and SoulSilver Chapter.|
|Eevee → Umbreon|
|Karen's two Murkrow were used primarily by Karen to leave with an unconscious Will after the battle had ended.|
|Houndoom was first seen at the Pokéathlon Dome with Karen and the other Elite Four members. It was then used to perform alongside Karen's other Pokémon at the various Pokéathlon courses.|
|Ho-Oh was granted to Karen by the Masked Man in order to prevent the Pokédex Holders from proceeding past the Ilex Forest Shrine. However, due to the combined efforts of the Pokémon and the Pokédex Holders, both Ho-Oh and Lugia are freed from Karen and Will's control.|