@leo,
You can customize toolTip content and change its color according to your requirements, please refer documentation on toolTipContent or toolTip.content for more info. Here is the updated JSFiddle with toolTip content being shown with color of corresponding dataSeries color.
One more doubt http://jsfiddle.net/273Lqh3g/103/ in this snippet only some channel values are getting displayed in tooltip.
Datapoint with y-value null will not be shown in toolTip.
—
Vishwas R
Team CanvasJS
