Chesire

 

Chesire  is the sister of Artemis. They do have some things alike but , Chesire is a villanous crook while Artemis is a hero. They do still have fellings for each other,and after artemis's death (spoiler alert she dosent actually die) she is angered and is out to kill aqua lad which is who killed her (spoiler alert .....again aqua lad is not evil he is a double agent for his team) 

Chesire

Artemis and Cheshire unmasked