I’d go for the middle finger of the three, rather than the fingers on the outside, the little finger and the index finger.
But then there’s the finger issue for cartoon characters in general. From a contributor on the Online Photographer site:
I just realized something very disconcerting this morning. Dilbert has too many fingers!
By way of illustration:
The poster goes on:
Everybody knows that cartoon characters from Mickey Mouse to Homer Simpson have three fingers and a thumb.
The consensus seems to be that four fingers (plus a thumb) is visually too many; hands tend to look like a bunch of bananas, as they say. But in drawing human figures, some cartoonists go for realism, and four fingers. So, Tintin:
and Terry of Terry and the Pirates: