@Riot any plans for Diana?
Used to be one of my favourite champions but it seems like her viability is dropping patch by patch.
She's the only diver that dies instantly if you screw up. She has tons of burst but with a decent support and locket you're not doing much, because she only has burst she can't dps afterwards.
You could try a tanky build but she doesn't have anything that benefits going tanky aside from her pretty small shield.
Also she can be played like an assassin but doesn't have the same kind of mobility other assassins have.