Morgana

You should always ban her, as her stun is your biggest enemy. Once you get stunned you are mostly dead. Keep your distance and try to always avoid her stun.

Blitzcrank

Always be cautious of his Q+E+R combo as it is rly powerfull in early as well as in the late game.

Leona

Perma stun. Nothing more to say.

Alistar

His combo is a big issue, but luckily that's the only threat. Keep your distance and poke him and adc frequently.

Braum

Same as with Alistar. Keep your distance of his stun and always be cautios of his ult once he hits lvl 6. Preferably try to poke ADC as his shield can block a lot of potential damage.

Rakan