When your account reaches level 40 in Aniimo, you unlock the Rainbow of Promise event. This event lets you choose one free unit from a pool of 14 Rainbow-tier Aniimo.
Because this selection is permanent and cannot be reset or traded away, choose your unit based on your current squad's missing combat roles, elemental coverage gaps, or traversal needs.
Comparing Rainbow Aniimo Roles
Evaluate candidate units by how their abilities address specific squad bottlenecks:
| Role Category | Key Mechanics | Recommended Squad Situation |
|---|---|---|
| Flame-Type DPS | Multi-hit skill sets, broad area-of-effect damage, rapid Guard gauge breaking | Choose if your squad lacks a fast clear unit for daily farming or boss Guard breaks. |
| Synergy DPS | Passive damage multipliers triggered by specific elemental allies | Choose only if you already own the matching elemental companion units required to activate the multipliers. |
| Defensive Support | Continuous health regeneration, damage-reduction shields | Choose if sustained exploration or tough encounters deplete your squad's survival tools. |
| Utility & Control | Attack reduction debuffs, movement slows | Choose to mitigate high burst damage in complex boss battles without relying purely on direct healing. |
| Exploration Lead | Enhanced jumping, gliding boosts, environmental gathering yield increases, hidden item detection | Choose if your combat roster is stable and you want to increase open-world gathering and traversal speed. |
How to Select Your Unit Without Regret
Follow these steps to confirm your choice before locking in the selection:
- Audit your main combat squad: Identify whether your team dies due to lack of defense, fails time limits due to low damage, or struggles against specific elemental boss types.
- Verify passive synergies: Check your existing roster to ensure you hold any secondary creatures required to trigger a candidate's passive combat buffs.
- Account for non-combat perks: Review the passive traits of candidates to see if movement skill upgrades or node gathering bonuses provide long-term exploration value when not fighting.
- Confirm elemental diversity: Avoid selecting a candidate that shares an element with your primary built attackers, as redundant element types limit your tactical flexibility in end-game matchups.
Free Aniimo Codes
Current active codes and how to redeem them.
Michael Smith
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Player Comments
37 players commented on this guide.
I wish I had read this before upgrading the wrong thing.
The explanation is clear, especially for beginners.
This guide answered the exact question I had.
This saved me time in the early game.