Chaos Zero Nightmare Assist Characters: Best backup units and synergies

Assist characters in Chaos Zero Nightmare are your off-field partners: they don’t run the main deck, but they add extra damage, defense, or card manipulation that pushes your core trio over the top. The best assists either directly fuel your main DPS’s mechanic or patch weak spots like survivability and card flow.

What Assist Characters Actually Do

• Provide off-turn effects: shields, chip damage, Vulnerable, AP/morale buffs, or cost reductions that trigger from simple conditions.
• Enhance specific archetypes: discard, Inspiration, banish/Futility, Ballista, counterattacks, etc., often by syncing with a lead character’s mechanic.
• Let you run leaner main decks: if an assist covers defense or utility, your on-field trio can lean harder into damage and cycling.

Think of them as “fourth slot” specialists you pick to match your main carry.

Best Assist Picks for General Teams

These are strong backups in most lineups and easy to recommend.

• Mika – universal sustain assist
  • Role: Healer / Support assist that provides reliable healing and survivability, letting your main three focus more on damage.
  • Use when you lack a full healer on-field or are pushing higher Zero System tiers where stress and HP spikes matter more.
• Khalipe – shield + sub-DPS
  • Role: Sub DPS/Tank; adds shields and AoE chip damage, protecting fragile carries while still contributing offense.
  • Great as a backup for aggressive teams that do not want to run a pure tank in the main trio.​
• Magna / Maribell – shield-focused frontliners
  • Role: Defensive assists providing continuous shielding and counterattacks.​
  • Ideal early-game backup when you are still building a stable frontline but want to keep main slots flexible.

These three cover generic “safety” needs: healing, shielding, and extra damage, usable with almost any DPS.

Synergy Assists for Popular DPS Cores

Assist picks become more powerful when they directly feed a specific carry’s engine.

• Chizuru and other mark/stack DPS
  • Wants: low-cost attack and draw assists to keep stacks flowing.
  • Good backups:
    • Yuki – helps with draws and low-cost attacks, keeping Chizuru’s stacking consistent.​
    • Rin – adds extra Void damage and single-target hits to finish marked enemies.​
• Yuki (Inspiration & AoE-focused)
  • Wants: discard synergy and AoE amplification.
  • Good backups:
    • Nia – best partner for Yuki thanks to discard, drawing, and damage boosts that accelerate Inspiration triggers.​
    • Veronica – AoE damage support with Ballista and draw power, speeding up deck cycle to find Yuki’s key attacks.​
• Kayron / banish–Futility archetypes
  • Wants: controllers that generate Futility/exhaust and dig for key pieces.
  • Good backups (from role guides):
    • Tressa / Beryl / Cassius as assist-style card engines that keep banish combos supplied and hands clear.

For each carry, look for an assist who shares their element or mechanic and either increases card frequency or multiplies damage.

High-Value Support Assists for Advanced Teams

Some units are particularly strong as off-field enablers in late-game or Zero runs.

• Narja – multi-role Instinct support
  • Offers damage amplification, healing, and cost reduction from a single slot; described as a “multi-functional support” whose kit is fully online at E0.​
  • Pairs especially well with established supports like Sereniel, acting as a dedicated cost-reduction and damage-boost engine behind them.​
• Owen – early Vulnerable enabler
  • Recommended by team-building guides as a starter support; applies Vulnerable and provides balanced performance that enhances any attacker.​

Advanced players often rotate these kinds of assists in and out of team shells to match specific Zero Codex penalties or boss patterns.

Picking assist characters this way, one generic sustain/shield option plus synergy-driven backups for your main DPS, turns the assist slot from an afterthought into a key part of your Chaos Zero Nightmare team’s power curve.