I'm a zen OTP
Here is what I got
Always have both orb up, no matter what
Your balls got infinite range and aim perfectly, so stay as far as possible from the opponent
You got 150 total HP. 50 HP + 100 Shield. You can snag small hp pack if you want to (they heal 75 total hp, and you have 50 hp, so the extra hp go to your Shield) but never the big one, it's no use unless you want to deny the opponent from it. Leave it to that ally you can't heal since you're already healing one with low hp
Never be scared of using tranquility. I tend to always wait the exact last moment but end up dying. Just go with it. Zen can heal and damage at the same time, that mean easy ult charge. Maybe try to detect when oppoenet have ult. Also, always go in front of the opponent when you ult, they can't shoot allies behind you.
Charged balls are powerful, whatever you do, always charge up before turning inside a corridor or when reaching the objective, you got a huge burst of damage at your hand that deal 230 if all orb hit non headshot. All flanker are dead with this. You can follow up with a melee if the opponent had 250 hp.
Orb last 3s after the targeted person (ally or opponent) is behind a wall. You can use this as a 3s wallhack for opponent.
You have 0 mobility. And with only 150 total hp, welcome to die. Stay near your dudes or ask a teammate to escort you.