They have an absolutely amazing relationship. Nightwing decides to wake up from his beauty sleep just to kill some innocent foal and Star dies. Then in a final battle Star burns himself out killing Nightwing. So yeah-lot of great chemistry going on there. I can see them having a cup of coffee talking about that time Star built that tower with a thousand rocks which then later crushed Nightwings girl. Then dinner with a side dish of chatting about Star having everything Nightwing ever wanted. Then Nightwing starts a blog about why he wanted Star's head completely detached from his body and Star starts a newspaper in which he complains about constantly wanting to be killed and how it sucks to be all powerful. You know, they start a war against each other, kill each other friends (not that Nightwing has any),try to kill each other and ultimately become BFFs. Settle down, start a herd and then have foals with their mates. All that Nightwing ever wanted. Well now I feel sad. I'M A NIGHTWING SYMPATHISER! :0