It's complete. Here's the number of times each character has appeared in a screenshot on the Dojo, with a couple disclaimers at the end.
Mario - 181
Kirby - 121
Wario - 96
Link - 81
Fox - 75
Yoshi - 68
Pit - 64
Samus - 59
Pikachu - 58
Meta Knight - 57
Ike - 56
Diddy Kong - 52
Donkey Kong - 52
Pokemon Trainer (all) - 52*
Zero Suit Samus - 48
Peach - 47
Lucas - 41
Bowser - 39
Snake - 37
King Dedede - 36
Zelda - 35
Sonic - 27
Pokemon Trainer (trainer) - 20
Ice Climbers - 19
Pokemon Trainer (Charizard) - 14
Pokemon Trainer (Ivysaur) - 10
Pokemon Trainer (Squirtle) - 9
*The full Pokemon Trainer count is tilted a bit in their favor, since it counts shots with both the trainer and a Pokemon as two, but I wouldn't count a screenshot of (for example) two Links as two for Link.
Disclaimers:
-Character profile pictures don't count because they're not screenshots. If you want them to, just add one to each character.
-If a screenshot was split, but one file, I counted it as one. The split shot in The Basic Rules only counts as one each for Mario and Link, and the four-way shot in Four Special Move Types only counts as one for Meta Knight. However, the three-way shot in Snake: Special Moves counts as three because there are three separate files.
-Movies don't count, but still screenshots of movies (e.g. the whole This World... update) count.
-Stickers in the Stickers update count.
-Avatars don't count.
-Trophies count.
-The Landmaster counts as Fox.
-The individual snapshots in one of the screenshots in Taking Snapshots are counted, although I couldn't figure out who the first snapshot in the last screenshot was. >_>
-I also couldn't figure out who got frozen in Ice Climbers: Final Smash.
-Character pictures from a screenshot of a game menu count. (e.g. Lucas is selected in the Handicap update.)
-The off-screen Lucas who just got KOed in Co-op Events isn't counted, while the about-to-be-KOed and difficult-to-see Pit in the same update is.
-Screenshots of screenshots that are being shared in the Share update are counted.
-Screenshots of the menu selections for Event matches aren't counted.