5★

Baby Blue

Star 5★ Arcanist

About Baby Blue

Baby Blue is a 5★ Star Arcanist in Reverse: 1999. Below are the exact Insight materials needed to ascend them, plus other Star Arcanists to build alongside.

Data updated: 2026-07-11

Baby Blue — Review & Analysis

Baby Blue is a Star Afflatus unit built around DEBUFF and Mental-side survival rather than raw DPS. Cough Syrup applies an AoE weaken that both lowers enemies' DMG dealt and raises their DMG taken, while House Play shreds a target's Mental DEF, making her a support piece that amplifies a Mental-focused team. Her passive also gives her strong durability against Mental attacks.

✓ Strengths

Cough Syrup is a two-way AoE weaken — cuts enemies' DMG dealt by up to 25% and raises their DMG taken by 25% (3 rounds), shielding the team while amplifying damage.
House Play shreds up to 35% of a target's Mental DEF, opening the way for Mental attackers to pile on damage.
The Don't Touch Her passive reduces DMG taken by 20% and boosts Crit DEF/Resistance when hit by Mental DMG, making her very sturdy against Mental enemies.
Star Afflatus counters Mineral for +30% DMG against that matchup.

✕ Weaknesses

The Ultimate's Nightmare is conditional — the target must already be under Attribute Down/Abnormal Status/Control, and it clears the moment any attack lands, so it's hard to leverage without a debuff-heavy team.
Star is countered by Plant (+30% DMG taken); her damage leans single-target and her meta placement is low, so she can't carry as a main DPS.

⚑ Build Priority

Level Cough Syrup (Incantation 2) first, as it's her core value — the two-way AoE weaken — then the Ultimate to unlock control, and House Play last. Since her role is support/debuff and survival, favor a Psychube that boosts debuff effectiveness, durability, or damage against weakened enemies rather than a pure crit-focused one.

Overview

Rarity

5★

Afflatus

Star

Birthday

March 14

Official Names

JA: ベビーブルーKO: 베이비 블루ZH-TW: 嬰兒藍

Afflatus Matchups

↑ Strong against

Mineral

↓ Weak to

Plant

Base Stats (max level)

Stats at Insight III, max level — from datamined values.

HP7,152

ATK953

Reality DEF498

Mental DEF615

Crit Rate6.0%

Crit DMG138.9%

Stats across Insight milestones

Base Stats (max level)	Lv.1	Lv.30	Insight 1 · Lv.40	Insight 2 · Lv.50	Insight 3 · Lv.60
HP	1,603	2,432	4,077	6,080	7,152
ATK	214	325	544	810	953
Reality DEF	112	169	284	423	498
Mental DEF	138	209	351	523	615
Crit Rate	4.3%	4.3%	4.8%	5.4%	6.0%
Crit DMG	136.4%	136.4%	137.2%	138.1%	138.9%

Baby Blue — Skills & Incantations

Full skill kit with values per upgrade tier.

House Play Incantation

“Insight II: 1-target attack. Deals 350% Mental DMG. Inflicts Mental DEF -35% for 3 rounds on the target hit.”

Insight 0: 1-target attack. Deals 200% Mental DMG.

Insight I: 1-target attack. Deals 200% Mental DMG. Inflicts Mental DEF -25% for 2 rounds on the target hit.

Insight II: 1-target attack. Deals 350% Mental DMG. Inflicts Mental DEF -35% for 3 rounds on the target hit.

Cough Syrup Incantation

“Insight II: Mass debuff. All enemies suffer DMG Dealt -25% and DMG Taken +25%. Lasts 3 rounds.”

Insight 0: Mass debuff. DMG -15% and DMG Taken +15% for all enemies for 2 rounds.

Insight I: Mass debuff. DMG -20% and DMG Taken +20% for all enemies for 2 rounds.

Insight II: Mass debuff. All enemies suffer DMG Dealt -25% and DMG Taken +25%. Lasts 3 rounds.

Good Friends & Tea Party Ultimate

“Insight II: Mass attack. Deals 400% Mental DMG to all enemies. If the target is in 【Stats Down】, 【Neg Status】, or 【Control】 statuses, inflicts 【Nightmare】 status for 1 round on the target.”

Insight 0: Mass attack. Deals 250% Mental DMG to all enemies. If the target is in Stats Down, Neg Status, or Control statuses, inflicts Nightmare status for 1 round on the target.

Insight I: Mass attack. Deals 350% Mental DMG to all enemies. If the target is in Stats Down, Neg Status, or Control statuses, inflicts Nightmare status for 1 round on the target.

Insight II: Mass attack. Deals 400% Mental DMG to all enemies. If the target is in Stats Down, Neg Status, or Control statuses, inflicts Nightmare status for 1 round on the target.

Don't Touch Her Incantation

“Insight III: When the caster takes Mental DMG, gives the attacker 1 stack of 【Wonderland Visitor】 for 2 rounds.”

Insight I: When the caster takes Mental DMG, DMG Taken -20% and Critical DEF +20%.

Insight II: Critical Resist Rate +10% when entering battle.

Insight III: When the caster takes Mental DMG, gives the attacker 1 stack of Wonderland Visitor for 2 rounds.

Skill Quotes

Official flavor quotes tied to each of Baby Blue's skill ranks, sourced directly from the game.

“Ding dong. Ding dong. There's no doorbell here.”

— Tea Party

“Ding dong. Ding dong. We don't lack guests here.”

— Tea Party

“Ding dong. Ding dong. They're all waiting for you, waiting for you.”

— Tea Party

“Aromas of fungi and dew.”

— Cough Syrup

“Aromas of fungi and dew. The puppies kept barking at it.”

— Cough Syrup

“Aromas of fungi and dew. A new world upside down. A party it is.”

— Cough Syrup

“Click. You can smell the fragrance, dear friends.”

— Tea with Friends

Insight Materials

Exact materials to raise this Arcanist's Insight level.

Insight 1

Sharpodonty × 12,000

Page of Starlit Ascent · +38 other characters also need this × 6

Silver Ore · +66 other characters also need this × 5

Spell of Fortune · +85 other characters also need this × 4

Insight 2

Sharpodonty × 30,000

Scroll of Starlit Ascent · +38 other characters also need this × 8

Solidus · +128 other characters also need this × 3

Biting Box · +126 other characters also need this × 2

Insight 3

Sharpodonty × 120,000

Tome of Starlit Ascent · +27 other characters also need this × 12

Incorrupt Monkeypaw · +34 other characters also need this × 5

Mistilteinn · +65 other characters also need this × 2

Resonance Materials

Materials to build out the Resonance tuning grid.

All 14 Resonance levels

Resonance 2

Moment of Dissonance · +128 other characters also need this × 4

Resonance 3

Moment of Dissonance · +128 other characters also need this × 4

Spell of Banishing · +56 other characters also need this × 6

Resonance 4

Moment of Dissonance · +128 other characters also need this × 4

Shattered Bones · +68 other characters also need this × 4

Solidus · +128 other characters also need this × 3

Resonance 5

Brief Cacophony · +128 other characters also need this × 4

Spell of Fortune · +85 other characters also need this × 4

Liquefied Terror · +96 other characters also need this × 3

Resonance 6

Sharpodonty × 25,000

Brief Cacophony · +128 other characters also need this × 4

Clawed Pendulum · +84 other characters also need this × 3

Resonance 7

Brief Cacophony · +128 other characters also need this × 5

Bifurcated Skeleton · +117 other characters also need this × 5

Resonance 8

Brief Cacophony · +128 other characters also need this × 5

Holy Silver · +121 other characters also need this × 3

Milled Magnesia · +70 other characters also need this × 5

Resonance 9

Brief Cacophony · +128 other characters also need this × 6

Prophetic Bird · +111 other characters also need this × 5

Esoteric Bones · +92 other characters also need this × 8

Resonance 10