Zac's health issues
Zac: He sacrifices health to damage enemies. Deals moderate damage. Can revive himself if needed.
Passive: Revive: Easy to kill. 1 or 2 damage hits to each blob. Enough time to get the job done. Minions help when killing blobs to make it easier. Health Regen: Hard to reach in certain times. Only useful when close to death. No real sustain. Also, blobs can be stepped on or dissapear.
Q: Deals damage. Hard to scale with such little AP ratio. Does the usual slow and can hit multiple enemies. Cannot pick up blobs.
W: Deals less than adequate damage to minions. Works best on tanks but even then does little justice.
E: Leaps to a location, knocking back champions and dealing some damage. Time to do attack has been lengthened for more power.
R: Deals the most damage but is hard to control. Knocks back champion 1 time. Deals reduced damage if on the same champion. Zac is able to be hit while in his ultimate.
Zac needs 1 of the following:
1: Raise the HP ratio for the revive to 25% and allow a 100% revive for better results.
2: Make blobs land behind Zac.
3: Make it so that when Zac gets a blob, he gain's a permanent bonus of 10 HP.
4: Make his Q able to pick up blobs.
5: Raise Q's AP ratio to 70%.
6: Raise Q's damage to 90/130/170/210/250.
7: Raise his W to deal 6/7/8/9/10% of enemies health.
8: Raise W's AP ratio to 4%.
9: Change his W to instead heal Zac by 2% for each enemy near him and deal the initial 40/55/70/85/100 damage only.
10: Make his E have a steady 1.1 charge.
11: Raise his E's AP ratio to 80%.
12: Raise his R's AP ratio to 80%.
13: Take away the reduced damage to the same enemy.
14: Allow 2 knock backs.
If you allow 1 (or more) of these, then I think Zac will be less easy to kill as he once was. Like, when I say easy to kill, he's just too squishy.