How to add a tag above a character's head?

Image that lots of characters in the scene ,so I want player knowing who they are , maybe there is a tag with his name above the character.

How to implement it?

I remember there is a thread about this in forum ,but I searched it just now, nothing found.

You could use a billboard to keep the tags always facing the screen (I’m guessing this is what you want) and then set each billboard’s position to be above that particular character…

As for how to get text onto the billboard I’m not sure. Textures would be messy, maybe panda3D has a built in routine for this? Someone else may be able to help here.

http://panda3d.org/manual/index.php/Billboard_Effects

perhaps this :
discourse.panda3d.org/viewtopic.php?t=3732