I strongly recommend this movie to everyone.
At first, the main character is self-righteous.
Simply speaking,
he only cares about himself.

However, one day,
he adopted three little girls so as to carry out his conspiracy agains his competitor.
The more time he spent with those children, the more softer his heart became.

It's an excellent movie.
Below is the quote from the ending part of the movie.
Gru reads his book for those girls in bedtime.

Gru: [reading the book he wrote]
One big unicorn,
strong and free,
thought he was happy as he could be.
Then three little kittens came around and turned his whole life upside down.
They made him laugh, they made him cry.
He never should have said goodbye.
And now he knows he can never part from those three little kittens that changed his heart.