Not sure if this has been posted, but I have just received my Animal Crossing New Horizons Official companion guide and it lists a bunch of stuff. One of those things is what reactions can be learned from certain villager types.
Personality
Sweet (??) - Pleased, Fearful, Sadness, Glee, Daydreaming
Peppy - Happiness, Aggravation, Sleepy, Curiosity, Mischief
Snooty - Joy, Intense, Thought, Sighing, Amazed, Love.
Big Sister - Greetings, Laughter, Cold Chill, Apologetic, Disagreement, Confident
Lazy - Delight, Bashfulness, Sorrow, Mistaken, Shyness, Pride.
Jock - Surprise, encouraging, Sneezing, Distress, Shocked, Flourish
Cranky - Agreement, Worry, sheepish-ness, Bewilderment, Inspiration
Smug - Smirking, Resignation, Heartbreak, Dozing, Showmanship.
Just thought it was interesting to note!
Personality
Sweet (??) - Pleased, Fearful, Sadness, Glee, Daydreaming
Peppy - Happiness, Aggravation, Sleepy, Curiosity, Mischief
Snooty - Joy, Intense, Thought, Sighing, Amazed, Love.
Big Sister - Greetings, Laughter, Cold Chill, Apologetic, Disagreement, Confident
Lazy - Delight, Bashfulness, Sorrow, Mistaken, Shyness, Pride.
Jock - Surprise, encouraging, Sneezing, Distress, Shocked, Flourish
Cranky - Agreement, Worry, sheepish-ness, Bewilderment, Inspiration
Smug - Smirking, Resignation, Heartbreak, Dozing, Showmanship.
Just thought it was interesting to note!