Well, let's see - the first one had Umi, Sora, and Sweet. But they didn't really matter to the plot any.
The second movie had Melody. Ugh.
The third movie had that annoying little girl.
The fourth movie had Sammy, but since he's actually Professor Oak, I don't think you can count him as a character of the day.
Fifth movie had what's-her-name - the little girl that Latias turned into.
Sixth movie had Butler.
Seventh had that whiny little wuss, Tooi.
Eigth has some surfer dude, I'm assuming.
So Movie 1 and 4 are absent of any annoying extraneous characters, at least . . .
The second movie had Melody. Ugh.
The third movie had that annoying little girl.
The fourth movie had Sammy, but since he's actually Professor Oak, I don't think you can count him as a character of the day.
Fifth movie had what's-her-name - the little girl that Latias turned into.
Sixth movie had Butler.
Seventh had that whiny little wuss, Tooi.
Eigth has some surfer dude, I'm assuming.
So Movie 1 and 4 are absent of any annoying extraneous characters, at least . . .