Mike my pleasure, glad it made the list. Also I was looking over the list and was surprised to see my Where’s Richard as the potential record holder for this. Your count seems to be right but it is missing one other little tid-bit I added. Not Wacky exactly so it may not rate inclusion but I also did add the Exterminator, arch-fiend from the Spider-Guy Krazy Comic to the painting. I was on a bit of a Wally Wood kick at the time and just happened to be reading the Krazy Comics as I was completing this Wacky Packages art.
You may not know this, Joe, but in the Marvel Multiverse (specifically, the mainstream Marvel Universe of Earth-616) there once was an actual supervillain named the Exterminator (real name: Phillip Wallace Sterling). He was one of the many leaders of a supervillain group named the Ani-Men I (Ape-Man I, Bird-Man I, Cat-Man I, Frog-Man I and Dragonfly (the last member was the only woman to be in the group)) before he was seemingly killed in that identity. Years later, Sterling was resurrected and assumed a second identity - Death-Stalker I, battled Daredevil the Man Without Fear several times (with many of these battles between them ending in a draw), then in his final battle with Daredevil, he briefly formed the Ani-Men II (Ape-Man II, Bird-Man II and Cat-Man II) before being killed in
that identity. So far, he's remained dead to this day. After his death, his elderly mother, Elizabeth Dawes Sterling, tried to get revenge on Daredevil by killing him in an elaborate deathtrap of her own creation, blaming him for her son's death, only to end up dying herself in the process before the deathtrap could even be set, much less used.
Sterling's first identity of the Exterminator has so far never been assumed by anyone else, but briefly another person (a woman) has assumed his second identity of Death-Stalker I. Death-Stalker II (so far as I know) has only appeared once and hasn't been seen since. Her real name remains unknown.
You can get more details on this subject in the Wikipedia article "List of Marvel Comics characters" under "D".