Koga is fast and hard to target, plus he is able to remove marks by dashing. Fight him at midrange to keep him from getting behind you. I recommend getting at least harmonious 3, his ult will end up healing your full health.
Seeing how there are no tips for fighting a Maeve, know when to back out, especially if she has street justice unless you have some serious life steal and a good aim. Maeve is VERY easy to deal with if you have a good aim.
When u play barik make different loadouts for turrets, shield, demage and try to counter the enemys build. Try to make uncounterable loadouts, for example do not make a loadout just focusing on turrets cos thats easy to counter with bulldozer card.
If you see someone take Makoa on opposite team, grab Inara and mothers grace legendary with earthen guard max cool down. The CC immunity makes Koa’s hook useless.
Watch out for Mal'Damba players, their stuns can be the end for you. Make sure to get resilience if you plan on taking them on alone to make the stunning as weak as possible. Until you get at least resilience 2, stay away from them.