excuse me for the poorly formed post, I was in a hurry.
What I meant was that the line-series in the legend should be the same as the line in the chart (not only by colour).
Here is an example.
This feature is currently not supported from the Kendo UI Chart. The colour is changed to give better representation in the legend as mismatching colours will create a confusing effect.
Still, I can suggest submitting a feature request and based on its popularity we may implement it in a future release: