It hasn't been asked, and tbh... I dunno if. I have any??
I like the concept of a giant far more than I do specific giant characters, I guess.
The only Specific ones to come to mind are the Iron Giant, and Kloontje het Reuzenkind (Kloontje the giant's child), which was a mascot at a long-defunct Dutch theme park named Het Land Van Ooit (The Land of Eventually) (works better in dutch), an adult woman playing the child of giants, so like. She was a kid. But big. you get it. I wouldn't say she's really a favorite though, but probably had an impact.

Rather than having been influenced by specific giant characters, it's stuff like Alice getting big in Alice's Adventures in Wonderland, or a couple Marvel characters like Kamala Kahn who can get big but aren't big by default. And of course the numerous cartoons and comics where a character gets big for an episode. Even like. The mushroom item in Smash Bros gsafghajsf
Oh, also of particular note are two Miku songs, Gigantic Girl and Time Machine, which depict her as a giant. Those are all things that influenced me a lot, but none of them are Characters Who Are Giants, yknow? I struggle to even think of any other giant characters that'd come close to being Favorites, kinda weird sfhgghaf
Maybe I'm just picky :P