There are unique lines for different tags already. There is no need to color common lines for different races and so on. For what? Accent?
Gender perhaps? I'm not much of a linguist but I think you need different endings for verbs (or adjectives or whatever) in some languages depending on if the speaker is male or female.
You might even imagine Red Prince would say "Don't be silly" using completely different words than Sebille.
It did seem odd at first but I can't say I notice it much any more.
