Great otp champs?

I LOVE Diana but shes more a midlaner. I had my fair amount of experience but in after they nerfed her or the magic items (one or more months ago) i dropped her completely because she had weak burst potential.(im also incredibly bad)

Do you habe recommendations for a fun jungler that is reasonable enough to achieve emerald? I like mechanicaly heavy champs but nothing like lee sin. Bro is breaking my hands.