Willow

He'd be gone for a while but he will always come back.

Picks his sister up from parties, eats the food she hid in the fridge for herself, or something like that

Struggle to understand why she's all sweet to him one day and looks at him and the shirt he's wearing with disdain the other not even bothering to talk to him

Especially from Rowan's pov:

"With the roar of the fire my heart rose to its feet/ Like the ashes of ash I saw eyes in the heat"

"Settle soft and as pure as snow/ I fell in love with the fire long ago"

"With each love I cut loose I was never the same/ Watching still living roots be consumed by the flame"

"[...] Though I've handled the wood, I still worship the flame/ Long as amber of ember glows/ All that "Would That I Loved" is long ago"

Like!!!!

Every red parts mentions Fire = Aelin

The only green I have is Rowan who's power is ice

And the purple can be what he became after Lyria.