What is the radical of this kanji character?

The lower part of his jeans was dirty with mud.

He is working as my manservant.

Shimobe is my best friend.

He practices kanji every day.

He is a kind-hearted person.

The hypothalamus is a part of the brain, and it plays a role in regulating physiological functions such as body temperature and appetite.

His design is always full of playfulness.

Kokoro is my best friend.

His heart was very kind.