Fictional characters from Gumball listed as real people under nonexistent "actors director" and "special thanks" credits

Gumball Watterson and Darwin Watterson, the two main fictional characters from the animated series The Amazing World of Gumball and its various spinoffs, are listed on IMDb as if they're real people, credited under Additional Crew as "actors director (as Main Character)" and Thanks as "the filmmakers wish to thank (as Main Character)", neither of which I have been able to find in the credits of Gumball episodes. I'm bringing this up here because, while I was able to remove the "Thanks" credit from the first episode and the unreleased movie, they're still listed under both labels in 240 episodes (239 for the Thanks credit from the removal of it in the first episode) from The Amazing World of Gumball, 40 episodes of the Wonderfully Weird World of Gumball, and 8 episodes of The Gumball Chronicles. That's just too much to individually report, so I'm bringing it up here to ask if there's a way to remove these bogus listings entirely in a much quicker fashion.

Reference Numbers:

• First episode, "Thanks": 260125-071649-986000
• Unreleased movie, "Thanks": 260125-015030-446000
• Unreleased movie, "studio teacher": 260125-071115-065000