How to display avatar when you have USERID?

Question

I'm trying to show all answerers' avatars on question lists. I have an array of userids.

Is there a built-in function to display an avatar and its clickable link when you have userid?

Example:

In the above illustrated image, kaka is the asker, there are three ppl who respond to his question.

Or, we have to do a MySQL query?

Comments

I have an array of userid, but don't know how to turn them into avatars. I thought there is a built-in function in https://docs.question2answer.org/code/functions/ but I cannot see it.