He set out on a journey of soul-searching.

I was surprised when I saw his dirty room.

Since that's his own concern, we better not interfere.

He should stop his selfish behavior.

He says that what you like to do, you do well, so he practices drawing every day.

He always has a mischievous smile on his face.

He has a warlike personality, always playing strategy games.

He likes toddlers and is always playing with children in the park.

The fact that he likes that movie is truly a case of 'there's no accounting for taste'.

That man-child is still living in his parents' house.