@DoomEternalHype Nightcap from my experience from playing her is balanced in her current state because on average, the Zombies' hitboxes are smaller compared to the Plants. So Nightcap is by far THE BEST at flanking any Soldier, Deadbeard and Scientist without having to take much aim because the hitboxes on her projectiles are big, and she deals 17 damage per hit, and to only land 6 of her primary shots without the Scientist or Deadbeard receiving heals should be a very easy vanquish.
If Deadbeard gets in his barrel, it shouldn't be a problem forcing him back out.
However, Nightcap has a weakness, and that SHE HAS THE BIGGEST HITBOX for a 75-HP character, specifically at the critical area. She's basically the most squishiest character in the game because she technically has 60-HP with no critical area. She's balanced with the Parkour upgrade now that the devs nerfed it because Wizard's have a much easier time landing the Z-Lixirs. So really, Nightcap is best at dealing with Scientist, Deadbeard and Soldier.
At the end of the day, she's balanced! Just use Wizard, Super-Brainz or Space-Cadet and you should counter her just fine.