Hey Brand is easy to deal with if you dodge the W. After that all he can do is emergency stun with E>Q.
Also he is a poor 1v1 fighter because he essentially has a useless ult against only one person.
Talon has burst, but if you surivive it he has nothing. So buy armor against him. Additionally retreat to tower when he ults. If he has to Q to reach you then he has less burst overall without his Q crit. He's super squishy so group up mid-late game and watch him splitpush because he can't do his job.
Viktor is super squishy and is a poor duelist if he misses his E, as it is the bulk of his damage. If you jump on him he has at most 1.5 seconds to drop a field on himself. It's his only defense though, so if you jump him after he E's he's usually helpless.
You're on your own with the others. :3