[quote=Necrosis]
Let's say darkside for fun.Also is there any characters that can change the sun colour/radiation?
[/quote]

Well, in theory using his telekinetic powers darkside could cause the star's chemical reactions to halt, snuffing out the star. Also, if Supergirl were to do that, it would destroy him physically, but not his soul. As stated before, he would then restart the fight by attacking her with his telekinetic strikes and lighting....so, that would only start a clash of the titans.