(Someone in Tumblr reminded me that they can speak holder names)

Kwami can't speak the name of their holder right? Or the name of someone else's holder correct? Even if they are ordered to, they will only burp bubbles. What are the limits and rules? Is there an outline of what a Kwami can and can not do?

What I know:

Kwami burp bubbles because they are physically unable to reveal their holder or anyone else's holder not even to other Kwami.

Edit: They can't tell other Kwami their holders names. People? Yes, they can.

Kwami can phase through walls and other objects.

Kwami can't be seen on video or pictures.

Kwami spit up stones made up of old holder hair to give to a holder they like.

That is all I know.