I want to change the point style of my legend to diamond but don't know how to do it. I am attaching the jsfiddle file in the comment.
The pointStyle should be updated to rectRot instead of rect. Please read more about it here
pointStyle
rectRot
rect
Updated JSFiddle
Edit: For adding a '%' sign at the end of each tooltip label, add a tooltip callback as shown in the following JSFiddle
'%'