User blog comment:Kittycatgirl1998 0.2/PG Proposal (remade) Cindy Lou Who/@comment-39032584-20200110040039

This could be seen as an interesting answer, but I'm saying yes specifically to her 2018 counterpart (as well as possibly to her live-action counterpart from the Jim Carrey film, if anyone cares to remember that). Apart from clearly being one of the main reasons for the Grinch redeeming himself and integrating into the Who's society, she also wanted to capture Santa Claus specifically to tell him her that what she really wanted for Christmas was for him to make things easier for her hard-working single mom, rather than any gifts for herself. So even the closest thing she has to what can possibly be seen as a minor corrupting factor only serves to make her an even more abnormally caring, selfless and pure-hearted child in that version.

That said, I have much more reservations about her 1960 cartoon counterpart (and, by extension, the version from the original book) qualifying. While she has no corrupting factors, she's also a much more flat character, and it's even debatable whether she was really the cause for the Grinch's change of heart there, since in that case, what really seemed to make him understand what Christmas was really about was seeing all of the Who's happy and singing together in spite of all of their material possessions being stolen. So yeah, if I'm being completely honest, I think this is one of those cases where her characterization varies enough that in certain versions, she qualifies, but in others, she just doesn't do anything of significance to qualify beyond simply having the basic personality for it.