Unlock Characters & Badges — Undertale Soul OPs 2

Undertale Soul OPs 2 launches with five starter characters — Sans, Papyrus, Undyne, Asgore, and Toriel — but the full roster expands through badges, achievements, and run milestones that gate alternate AU fighters and perks. Badges are separate from coin Tier upgrades (1,250 per step, Economy); you can own a unlocked hero at Tier 1 while another starter sits at Tier 5. This guide maps unlock paths, class considerations, and how badge farming fits Normal clears, Endless, and Hard Mode.

Starter roster and roles

All accounts access the same launch quintet. Each maps to Attack, Defense, or Support classes detailed on Playable Characters:

Starter	Community role note
Undyne	Best beginner pick — range + survivability (Getting Started)
Sans	High burst, demands dodge skill (Controls)
Papyrus	Control and setup between Defense and Attack
Asgore	Strong soul anchor, slower DPS
Toriel	Support/defense hybrid for inner ring (Defend Souls)

Starters remain viable at Tier 5 — unlocks add variety, not strict power creep. Check Tier List before grinding a badge for a C-tier novelty pick.

Jevil Tier 4 and Time Revert perk showcase

How badge unlocks work

Badges track cumulative stats across runs: waves cleared, bosses defeated, perfect waves, mode-specific wins. Completing badge tiers unlocks:

• New playable characters outside the starter five
• Permanent perks usable in future lobbies
• Occasionally cosmetic or title rewards (patch-dependent — see Updates)

Badge progress persists on your Roblox account. Wiping on Gaster (Beat Gaster) still credits boss attempts if you dealt qualifying damage before fail.

Unlock strategies by goal

Unlock a new Attack main for Endless DPS:

• Farm Normal → Gaster until badge counters for that character appear in UI
• Stack perfect waves (+25 coins) for dual progress — coins fund Tier, badges fund unlock (Economy)
• Run Endless after Gaster for wave-count badges

Unlock Support for Hard Mode:

• Hard bosses (Hard Mode) check healing — badge-gated Supports often ship stronger E abilities
• Badge requirements may include “clear US Papyrus” or “survive Fresh Sans” — learn fights first on starters

Unlock perks without new characters:

• Some badges grant perks only — still worth routing through Tier Unlock Planner because perks + Tier 5 define power

Class coverage for five-stacks

When unlocking, aim for roster breadth:

1. One Attack you can Tier 5
2. One Defense for soul anchor
3. One Support for Hard/Endless sustain
4. Flex picks for Team Comp Checker gaps

Unlocking three Attack variants while your squad lacks Support guarantees pub-lobby struggles.

Boss-linked unlock hints

Specific characters and perks tie to boss exposure (community-confirmed patterns — verify after major patches):

• Normal arc — Omega Chara, Underfell Sans, Outertale Asgore, Gaster attempts increment AU badges (Normal Walkthrough)
• Secret — Dio Sans coffin encounter may gate joke or crossover picks (Secrets)
• Hard arc — US Papyrus, Fresh Sans, Dream Sans wins unlock Nightmare/Fresh-themed roster entries

You do not need to defeat every boss first try — participation thresholds still move badges on many counters.

Coins vs badges — order of operations

1. Tier 2–3 on starter main (immediate power)
2. Badge unlock hero you plan to main long-term
3. Tier 5 on that main before unlocking side heroes
4. Perk badges that synergize with class (Economy shop perks stack)

Badges without Tier investment underperform in Endless scaling.

What does NOT unlock characters

• Promo codes — none stable (Codes)
• Official Trello — does not exist; ignore rehost links
• Scripts — may spoof visuals, not legitimate unlocks
• Robux — verify in-game shop UI; wiki documents gameplay badges primarily

Events and limited unlocks

Events occasionally add limited-time badges or boosted progress weekends. Read event rules — some require Normal only, others Hard.

After unlocking — integration checklist

1. Read kit on Playable Characters
2. Run one Normal lobby learning M1/Q/2/E/R (Controls)
3. Tier to 2 before Hard pub queues
4. Add to Team Comp Checker presets
5. Re-evaluate Tier List placement for your skill level

Unlocking is half the journey — Tier 5 and soul discipline (Defend Souls) make new characters feel earned instead of cosmetic.

Hard Mode unlock milestones

• Fresh Mode — Complete Fresh Mode badge and Fresh Sans Tier 4 path
• Nightmare Mode — Abomination and Dream Sans unlock track
• Dio Sans — Take on 『The World』 badge and Regeneration
• Map Perks — Quack duck and Zapper finds