S-Grade Survivors are the top-tier characters in Survivor.io, offering unique passives and combat synergies that can dramatically boost your performance. However, not all of them are equal — some shine in endgame synergy builds, while others are better suited for early progression.

This Survivor.io S-Grade Survivors Tier List guide breaks down each S-Grade Survivor into tiers, highlighting their strengths, weaknesses, and when to use them.

Survivor.io S-Grade Survivors Tier List – Best & Worst Ranked

C Tier – Master Yang

Master Yang isn’t bad at all, but compared to other S-Grade survivors, he eventually falls behind.

• Strengths:
  • Inflicts Vulnerability on enemies.
  • Boosts Critical Damage, making him an excellent starting S-grade option.
• Weakness:
  • Once your crit rate reaches ~93%, the crit damage bonus becomes less impactful.
  • Outclassed by higher-tier survivors who bring stronger debuffs and synergy effects.
• Verdict:
  Great for early to mid-game, but you’ll want to transition to someone stronger once you unlock better synergy options.

B Tier – Matalia

Matalia offers more utility than Master Yang but still isn’t top-tier compared to the newer survivors.

• Strengths:
  • Can inflict Poison, Weaken, and Chill on targets.
  • Good synergy skills that stack well as she levels up.
  • Useful for combat harmony setups.
• Weakness:
  • While versatile, her damage output isn’t as high as S- or A-tier survivors.
  • Many players eventually move on once stronger debuff-focused survivors are available.
• Verdict:
  A solid secondary survivor who adds valuable debuffs, but not a must-have for late-game.

A Tier – Joey

Joey used to be a strong main option, but with the introduction of newer survivors, his relevance has dipped.

• Strengths:
  • Gains real value once synergy unlocks.
  • Provides respectable damage and decent survivability.
• Weakness:
  • Largely overshadowed by Tloxa, who does everything better.
  • Limited scaling compared to S-tier options.
• Verdict:
  Still better than Yang and Matalia as a main survivor, but you’ll eventually want to swap him out.

S Tier – Tloxa

Tloxa is where things start to get powerful.

• Strengths:
  • Creates Weak Spots on bosses and enemies.
  • Every ~200 attacks, applies Exposed, letting you deal bonus percentage damage to Chilled, Poisoned, or Weakened targets.
  • Scaling improves with stars:
    • Starts at 5 seconds of Exposed.
    • At 3 stars, this increases to 20 seconds.
    • Also increases Weak Spot damage.
• Weakness:
  • Requires synergy and star levels to truly shine.
• Verdict:
  A strong all-rounder who excels in boss fights and synergizes extremely well with debuff-heavy builds.

S+ Tier – Toxa (Best Survivor)

The newest S-Grade survivor, Toxa, is currently considered the best of the best.

• Strengths:
  • Can inflict Laceration, a powerful debuff previously exclusive to the Ninja Turtles.
  • Scattered Spikes ability spreads laceration, stacking heavy damage over time.
  • Laceration synergizes with other debuffs for even more DPS.
  • Exceptional at clearing mobs and chunking down bosses.
• Weakness:
  • Being new, balance changes are possible, but as of now, she’s unmatched.
• Verdict:
  The top S-Grade survivor in Survivor.io. If you can unlock Toxa, she should be your go-to choice for all content.

Final Tier List Ranking

Here’s the full ranking based on current performance:

• S+ Tier: Toxa
• S Tier: Tloxa
• A Tier: Joey
• B Tier: Matalia
• C Tier: Master Yang