There are several alternatives for a solution of this problem:
It is possible to limit the number of characters using maxChar keyword. Please take a look at this article: http://www.anychart.com/products/anychart/docs/users-guide/index.html?label-text-formatting.html#maxChar
use the tooltips to display this information
Also about different styles: you can create the style and apply it to a point, not only to a series:
<point name="Point 1" y="4123" style="Style 1" />