He has a serious Oedipus complex.

He is showing typical symptoms of the Oedipus complex.

I learned about the Electra complex in psychology class.

He is studying the Oedipus complex.

He is rumored to have a Lolita complex.

He has a sister complex and is always worried about his younger sister.

He thinks he can control everything, it's like a God complex.

They (referring to women or girls) are my best friends.

She always likes gossip, and gets excited when she knows someone's secret.

There's a proverb that says 'speak of the devil and he shall appear,' and sure enough, he showed up.