- Undertale Adventures all units cover five core characters: Sans, Undyne, Papyrus, Toriel, and Frisk.
- Roles matter more than rarity: judge each unit by its battlefield contribution, not appearance.
- Sans and Undyne anchor late-game teams; Papyrus and Frisk carry early progression.
- Toriel provides defensive and support value that protects your upgraded carries.
- Reroll traits only on units confirmed for your long-term roster.
Undertale Adventures All Units: Roster Overview
In Undertale Adventures X, the Roblox Undertale-inspired tower defense game, your roster determines how far you can push through story stages, farming runs, and high-difficulty content. Every unit fills a distinct battlefield role: damage, control, support, or flexible early-game filler. Understanding what each unit actually contributes — instead of chasing rarity alone — is the single biggest improvement a new player can make.
| Unit | Role | Phase | Team Value |
|---|---|---|---|
| Sans | Advanced damage and control | Late game | ★★★★★ for difficult waves |
| Undyne | Sustained primary damage | Mid to late game | ★★★★★ for progression |
| Papyrus | Early and mid-game damage | Early game | ★★★★ while building roster |
| Toriel | Defensive support utility | Mid game | ★★★★ in pressure stages |
| Frisk | Starter flexible unit | Tutorial | ★★★ for learning basics |
A good roster combines reliable early damage, upgraded late-game carries, and utility that handles crowded waves or powerful enemies. One premium unit never replaces a balanced team.
Unit Roles and Strengths Compared
Each unit's value changes with the content you are playing. Early stages reward cost efficiency and reliability; late-game stages reward scaling, crowd control, and boss damage. Use this comparison to decide where to invest your upgrade currency.
Damage Carries
- Sans: high-impact damage and control
- Undyne: consistent sustained pressure
- Best against dense waves and bosses
- Upgrade priority: high
Support and Defense
- Toriel: stabilizes difficult waves
- Protects upgraded carries
- Pairs with Undyne or Sans
- Best in pressure-heavy stages
Early-Game Fillers
- Papyrus: dependable early damage
- Frisk: flexible learning unit
- Transition out as roster improves
- Cheap and easy to position
| Unit | Attack Profile | Best Stages | Upgrade Value |
|---|---|---|---|
| Sans | Repeated attacks on long route exposure, upgraded effects over long waves | Late story, boss encounters, high-difficulty waves | High |
| Undyne | Consistent pressure, stays useful as waves get denser | Normal stages, long survival waves | High |
| Papyrus | Practical damage for first stable formations | Opening content, early farming | Medium-high |
| Toriel | Stability, protection, and utility over raw damage | Sustained-wave stages | High in pressure maps |
| Frisk | Simple placement loop, fills roster gaps | First stages, formation testing | Low long-term |
A strong position can outperform a higher-cost unit placed where it barely sees the route. Always watch the enemy path before spending all your starting currency.
Tier List by Content Type
A useful tier list depends on the stage being played. Early-game units are judged by cost efficiency and reliability, while late-game units are valued for scaling, crowd control, boss damage, and the ability to support a complete team.
| Tier | Category | Units | Reasoning |
|---|---|---|---|
| S | High-difficulty content | Sans, Undyne | Scaling, control, and boss damage for demanding waves |
| A | General progression | Papyrus, Toriel | Dependable coverage and stability through normal stages |
| B | Early-game / transition | Frisk, Flowey | Useful for learning and filling open team slots |
Prioritize Sans when available, but do not weaken the rest of your team just to obtain one premium unit. A complete roster clears more content than a single carry.
Team Combinations That Work
- Sans + early-game anchor: pair with Papyrus or Frisk so Sans can be upgraded safely.
- Undyne + Toriel: sustained damage protected by defensive support for pressure stages.
- Multi-lane coverage: add a second damage source when a stage splits the enemy route.
- Budget formation: Frisk and Papyrus cover early waves from multiple positions at low cost.
Step-by-Step: Building Your Unit Team
Audit Your Roster
Review your strongest units, their roles, and the content you currently cannot clear. Filling a major damage, support, or coverage gap beats summoning another unit that duplicates a job you already have.
Build a Balanced Opening Team
Place reliable early units (Papyrus, Frisk) near the first choke point, then add a second unit only after the opening wave is stable. Keep currency in reserve for the next wave.
Upgrade Before Expanding
Concentrate upgrades on your best-positioned unit rather than spreading weak units across the map. Prioritize units covering long sections of the path.
Add Support and Control
Once damage is stable, add Toriel or another support unit to protect your invested carries through difficult waves.
Reinvest and Refine
Replay stages for resources, test new units in normal content before hard stages, and adjust the team whenever a stage introduces faster or tougher enemies.
Progression becomes smoother when upgrades are based on actual battle performance instead of rarity alone. Track which units consistently contribute during full waves.
Traits and Summoning for Your Units
Traits add combat advantages — damage, attack speed, range, or survivability — that change how efficiently a unit performs. Rerolls are a limited resource, so spend them where they matter.
| Trait Focus | Best Unit Role | Resource Priority |
|---|---|---|
| Damage traits | Main carries (Sans, Undyne) | High — permanent carries first |
| Range and attack speed | Multi-lane coverage units | Prioritize when it fixes a placement weakness |
| Support and control traits | Toriel and utility units | Reroll only after support function is reliable |
| Early-game traits | Papyrus, Frisk | Low — these units get replaced |
For summoning, follow a simple discipline: establish a functional roster first, set a currency reserve, and only spend above it when a target directly improves your team. Higher rarity indicates collection value, but rarity alone does not replace role coverage or compatibility. Keep duplicates until you confirm whether they are needed for enhancement or exchange systems.
Do not spend reroll resources on a unit until it is confirmed as part of your active or long-term team. A carefully chosen reroll target produces a bigger improvement than spreading resources across many incomplete units.
Collection Checklist and FAQ
Unit Collection Milestones:
- Build a stable early team with Papyrus and Frisk
- Obtain Undyne as your core sustained damage
- Add Toriel for defensive support coverage
- Unlock Sans for high-difficulty content
- Reroll traits on your first permanent carry
Q: What are all the units in Undertale Adventures X?
The core roster includes Sans, Undyne, Papyrus, Toriel, and Frisk, each filling a distinct role: Sans and Undyne serve as damage carries, Papyrus and Frisk handle early progression, and Toriel provides defensive support.
Q: Which unit should I upgrade first?
Upgrade your best-positioned unit rather than spreading resources widely. In practice, Undyne offers high value for general progression because upgrades improve a reliable core damage option you will keep using.
Q: Is Sans worth weakening my team to obtain?
No. Sans is a strong S-tier unit for high-difficulty content, but do not sacrifice the rest of your roster to get one premium unit. A complete, balanced team clears more content.
Q: How should I handle duplicate units from summoning?
Keep duplicates until you confirm whether they are required for enhancement, progression, or another in-game exchange. Do not discard or convert them before checking their intended use.
Q: Which units should get trait rerolls first?
Use rerolls on core damage dealers first, followed by essential supports and difficult-stage specialists. Skip temporary units like Frisk that will be replaced as your roster improves.