Kennit is a Warder.
He is bonded to Eldrith Jhondar, who is Black Ajah. But he is not a Darkfriend and when he discovered her true affiliation Kennit tried to find her to punish her about it, even if it means death also for himself.
Due to Eldrith's carelessness, Kennit was able to use her Warder bond to track her to Samara. He was sure that she was a murderer, half convinced she was Black Ajah, and determined to kill her no matter the consequences to himself.
Eldrith forbade the rest of the Black sisters with her to harm him, because she fears the pain of the death of a Warder, prompting them to flee Samara and head to Caemlyn.
When Eldrith loses track of time and arrives back late, Chesmal Emry fears that Kennit may have caught up with them again.
The current fate or location of Kennits are unknown, if he escaped the shock of the death of Eldrith by Doilin Mellar, he remains a wildcard.