which champs can stay versus him well w/o junglers help?
and ur opinion about kassadin - OP?

Non-AP champs.

With brand I managed almost every kass.

" Hi guys , i will go corki mid"?

pick jax

How to counter a pro Kassadin by using ap-champ?

Irelia is a hard counter to kassadin really hard counter.

Xin counters Kassa like a charm ... Dash + Q before he's 6, almost nothing he can do about it. Or Cassiopea, whenever he moves in to harass he gets a Q in the face, while you get a speed buff, so he can't move into range to Q you, without tanking your minions.

cassiopea / brand cant do anything, Q(silence) and make distance out of em = they do nothing and take dmg.