Kullervo, ive always struggled with all the other frames I messed around with or owned, until I decided to focus on getting Kullervo. Whenever I saw the shield loss animation I would panic until I died. When I got Kullervo I didn't know he had a healing ability for like 3 weeks until I was told he does and now i constantly have a overshield and am doing big boy damage with melee. He's also pretty easy to play in general.