This movie is not light-hearted. It punches you in the gut just when you think you've seen all the bad there is to see. The only thing that makes it worthwhile is its stubborn ideal that good will overcome evil.
They were caricatures rather than actual humans. They represented the ideal family values. And the one parent who didn't subscribe to these traditional family values was outcasted and depicted as a threat to the family unit (cheater and deadbeat dad).
The first Inside Out movie came out when I was 13. I am now 22 years old and the movie still has a chokehold on me. So of course, I had to drag my friend to the nearest cinema so she could experience whatever masterpiece Pixar had just released (with me). And the only part of it I regret is the part when I had to covertly wipe my tears. Yes, I know it's a universal experience to cry during a Pixar movie but the older I get, the less I want people to see me cry.