"... she's a magical character who — whoda thunk — actually makes stuff happen! Frequently! And it's not generic crap like fireballs or electricity (that makes you a bender, not a magician) — it's geniunely unpredictable phemonena."
Adaptational Wimp: Not a traditional example, but when Robb asks Winnie to make some women fall in love with him in "Skyway to the Danger Zone", she answers, "Magic can't control love!" Contrast this with the fact that the TV show had an episode in which Winnie brainwashed a quarterback's girlfriend into loving Robb to the point of annoyance.
Alliterative Names: At least two of Winnie's alter egos, Fräulein Frankfurtress and Liz Lolly, have these.
End of Episode Silliness: On the last page of "When the Stranger Calls", Winnie tells the Harper kids that now that she can live among mortals, she might move into a suburban house made of chocolate. She proceeds to transform the Harpers' house into a confectionary palace, and says that "maybe" she'll change it back before Thomas comes home.
Hearing Voices: In "When The Stranger Calls", a higher-up from Winnie's realm tries to convince the Harper kids to let him take Winnie away by telling them that Winnie's wanted by the authorities of her realm, and could inflict Cold-Blooded Torture on them if they keep her long enough.
Humans Are Bastards: In-Universe given by Winnie as the explanation for why the magical world doesn't intervene more (such as to prevent disasters or ease suffering)...most of her race wrote off humans as a lost cause eons ago.
I Ate What?: While Winnie assures Jessie and Robb in "Skyway to the Danger Zone" that she shouldn't have trouble adjusting to contemporary human life, she drinks a bottle of Joy. Jessie then tells Winnie that the bottle contains dishwashing soap, and that she shouldn't drink any more of it.
I Choose to Stay: Winnie could have left the Harpers after helping Gene win the bowling tournament he got forced to attend in the Pilot, but she had so much fun with those kids that she decided to live with them.
Winnie: To you guys, I'm amazing! Where I come from, I'm nothing special...I'm nobody! They told me I'd be miserable here...but I feel I was lied to...You really appreciate me...you make me feel like a star! I fit in better here...in this world...with you...then I ever did back home! I feel..........free!
Laser-Guided Amnesia: According to Winnie, after a witch finishes granting a mortal's wish, the mortal forgets about meeting her as she heads back to her homeworld.
Missing Mom: The Harper kids' parents are divorced, as mentioned above.
Mundane Made Awesome: For starters, Gene asks Winnie to demonstrate some witchcraft for Robb and Jessie by fetching him some eggs. Winnie fulfills this task by filling the kitchen cupboard with live chickens, proceeding to take two eggs from one of them.
The Keiki story "Haole Berry" has a scene where Beefer throws rocks at Winnie, Jessie, and Gene. He admits to Keiki that he doesn't know who any of them are, but has an inexplicable hatred for them.note The reason probably relates to Peter's announcement that Free Spirit will displace Keiki as a flagship comic.
Really 700 Years Old: Winnie looks and acts like a young adult, but was actually 349 by the time she met Gene.
Secret Keepers: No mortals other than the Harper children know about Winnie performing witchcraft.
Sealed Good in a Can: Winnie fears getting trapped in a mirror. A witch can not escape one by herself, and if no one lets her out before it breaks, she will die.
The pilot lampoons some current pop female singers after Winnie zaps up some tickets for Robb and Jessie to watch "Lady Plastique".
Peter Paltridge: In the original [show's first episode], Robb and Jessie want to see a metal band named "Pond Scum." Here it's been updated to something people would pay for today — a female singer who puts on so much costuming and padding you can't tell who's really under there. Seems like Lady Gaga, but I was thinking of Nicki Minaj, who's so overdone that she literally looks like a plastic doll.
The kids recall in "Skyway to the Danger Zone" that Winnie tried to watch The Big Bang Theory, but found it "too far-fetched!" To put her standards of realistic TV into perspective, they also discuss her developing an interest in Sleepy Hollow.