Whitetail and Onestar did not become mates in the Warriors series. Whitetail is a warrior of ThunderClan and Onestar eventually became the leader of WindClan, but they did not develop a romantic relationship in the books.
She is is wearing black Coat
White
No I doubt it. Because he is a fair leader.
What colour coat matches purple shirt
Onestar
Lilac.
He hasn't died yet, but he has to eventually!So read omen of the stars
status unknown
Onestar
Chestnut
Onestar is the WindClan leader after Tallstar. Onestar's warrior name was Onewhisker, and he and Fireheart became friends when Fireheart and Graystripe brought WindClan back. When Tallstar was about to die, he told Firestar that he did not want his deputy, Mudclaw, to rule WindClan, and he made Onewhisker the leader right before he died.