Can we get a more clear representation of the different types of fighters/tanks

There is an obvious difference between the kinds of fighters that are lighter dodgier fighters and the ones that are sustain/tank fighters. Renekton and fiora should be lebeled differently Sion and illaoi are in a different class than jax or irelia in my opinion. for that matter it seems like a lot if not all tanks are in a gray area for fighters for instance what is mundo? what is nasus? this isnt exactly clear to me.