The Binding of Isaac: Rebirth is the ultimate roguelike for item synergy enthusiasts — over 700 items that combine in thousands of emergent ways, many of which the developers never explicitly designed. One run you're firing homing lasers, the next you're spawning an army of familiars, and the next you're a ball of knife-shooting orbital meat. The game's depth is staggering: 34 playable characters (including Tainted variants), 12 endings, secret floors, challenge runs, and an item pool so vast it takes hundreds of hours to see everything. The Repentance expansion is considered the definitive version, adding two new characters, hundreds of items, and the hardest content in the game.
Choosing the right build shapes your entire experience. This guide breaks down every option — what they're good at, what they struggle with, and which one matches your playstyle. For optimized builds with full gear sets, see our builds guide.
Quick Comparison
| Build | Tier | Playstyle | Best Equipment | Beginner Friendly? |
|---|---|---|---|---|
| Isaac | A | Use the D6 to reroll bad items into good ones. Prioritize tear modifiers (Brimstone, Tech X) and damage ups. Isaac can become anything based on what the D6 generates. | Brimstone | Yes |
| Azazel | S | Fly over obstacles and hazards, charge Brimstone, and sweep the room. Range upgrades are the highest priority since they extend Brimstone's reach dramatically. | Mom's Knife | Moderate |
| Judas | S | Activate Book of Belial before boss rooms for guaranteed Devil Deals and +2 damage. Play aggressively since your high damage kills enemies before they can threaten your low HP. | Sacred Heart | Moderate |
| The Lost | B | Never get hit. Take every Devil Deal for free. Holy Mantle gives you one hit of protection per room — use it as insurance, not as a crutch. | Godhead | No |
| Tainted Characters | varies | Each Tainted character demands a unique strategy — Tainted Keeper must spend coins to survive, Tainted Bethany uses soul hearts as spell charges, Tainted Jacob is chased by Dark Esau. | Tech X | No |
New player? Start with Azazel — see our beginner's guide for why.
Isaac
Isaac is the default character with balanced stats and the D6 active item — the most important item in the game. The D6 rerolls pedestal items, letting you cycle bad items into good ones. Isaac's flexibility comes from being able to shape his run through strategic rerolling. He has no weaknesses but no starting advantages either.
| Attribute | Detail |
|---|---|
| Tier | A |
| Playstyle | Use the D6 to reroll bad items into good ones. Prioritize tear modifiers (Brimstone, Tech X) and damage ups. Isaac can become anything based on what the D6 generates. |
| Best Equipment | Brimstone |
| Stat Priority | Tears (fire rate), damage, range |
| Core Gear | D6 (starting item), any strong tear modifier, health upgrades |
| Key Mechanic | item synergies |
Strengths
- Highest overall performance across all content types
- Use the D6 to reroll bad items into good ones. Prioritize tear modifiers (Brimstone, Tech X) and damage ups. Isaac can become anything based on what the D6 generates.
- Pairs well with Brimstone
Weaknesses
- Popular choice, competition for resources
- Needs specific gear to reach full potential
Recommended Progression
- Start in Basement to learn Isaac-specific mechanics
- Focus on item synergies — it's this build's primary system
- Prioritize Brimstone as your first major upgrade
- See our full Isaac build guide for the optimal gear progression
Azazel
Azazel starts with a short-range Brimstone beam and flight — two of the strongest abilities in the game, for free. His Brimstone clears rooms instantly in the early floors. The only downside is the short beam range. Azazel is the best character for unlocking completion marks and learning the game.
| Attribute | Detail |
|---|---|
| Tier | S |
| Playstyle | Fly over obstacles and hazards, charge Brimstone, and sweep the room. Range upgrades are the highest priority since they extend Brimstone's reach dramatically. |
| Best Equipment | Mom's Knife |
| Stat Priority | Range (extends Brimstone), damage, speed |
| Core Gear | Starting Brimstone, any range up, any damage up |
| Key Mechanic | character unlocks |
Strengths
- Most versatile — adapts to any situation
- Fly over obstacles and hazards, charge Brimstone, and sweep the room. Range upgrades are the highest priority since they extend Brimstone's reach dramatically.
- Pairs well with Mom's Knife
Weaknesses
- Lower peak damage than S-tier options
- Needs specific gear to reach full potential
Recommended Progression
- Start in Basement to learn Azazel-specific mechanics
- Focus on character unlocks — it's this build's primary system
- Prioritize Mom's Knife as your first major upgrade
- See our full Azazel build guide for the optimal gear progression
Judas
Judas starts with the highest damage multiplier (1.35x) and the Book of Belial (+2 damage when activated, also increases Devil Room chance). He has only 1 red heart, making him a glass cannon. With Book of Belial active, Judas outdamages every other character. Devil deals are easy to access due to Book of Belial's bonus.
| Attribute | Detail |
|---|---|
| Tier | S |
| Playstyle | Activate Book of Belial before boss rooms for guaranteed Devil Deals and +2 damage. Play aggressively since your high damage kills enemies before they can threaten your low HP. |
| Best Equipment | Sacred Heart |
| Stat Priority | Damage (already high), soul hearts for survivability, speed |
| Core Gear | Book of Belial, devil deal items, damage multipliers |
| Key Mechanic | room clearing |
Strengths
- Best survivability for learning hard content
- Activate Book of Belial before boss rooms for guaranteed Devil Deals and +2 damage. Play aggressively since your high damage kills enemies before they can threaten your low HP.
- Pairs well with Sacred Heart
Weaknesses
- Slower progression speed
- Needs specific gear to reach full potential
Recommended Progression
- Start in Basement to learn Judas-specific mechanics
- Focus on room clearing — it's this build's primary system
- Prioritize Sacred Heart as your first major upgrade
- See our full Judas build guide for the optimal gear progression
The Lost
The Lost has no HP — any damage kills instantly (unless you have Holy Mantle, which blocks one hit per room). The tradeoff is access to all Devil Deal items for free and flight from the start. The Lost is the ultimate high-risk character — incredible power potential but zero margin for error. Unlocking all Lost completion marks is a badge of honor.
| Attribute | Detail |
|---|---|
| Tier | B |
| Playstyle | Never get hit. Take every Devil Deal for free. Holy Mantle gives you one hit of protection per room — use it as insurance, not as a crutch. |
| Best Equipment | Godhead |
| Stat Priority | Holy Mantle (mandatory), damage, tears |
| Core Gear | Holy Mantle (unlocked through Greed Mode), free devil deal items, flight |
| Key Mechanic | devil and angel deals |
Strengths
- Excellent in group and cooperative content
- Never get hit. Take every Devil Deal for free. Holy Mantle gives you one hit of protection per room — use it as insurance, not as a crutch.
- Pairs well with Godhead
Weaknesses
- Less effective solo
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in Basement to learn The Lost-specific mechanics
- Focus on devil and angel deals — it's this build's primary system
- Prioritize Godhead as your first major upgrade
- See our full The Lost build guide for the optimal gear progression
Tainted Characters
Repentance adds 17 Tainted variants of each character with radically different mechanics. Tainted Isaac has limited item slots. Tainted Cain crafts items from pickups. Tainted Lazarus alternates between two forms each room. Tainted Lost has Holy Mantle but can only get 'better' quality items. These are the endgame challenge characters.
| Attribute | Detail |
|---|---|
| Tier | varies |
| Playstyle | Each Tainted character demands a unique strategy — Tainted Keeper must spend coins to survive, Tainted Bethany uses soul hearts as spell charges, Tainted Jacob is chased by Dark Esau. |
| Best Equipment | Tech X |
| Stat Priority | Varies per character |
| Core Gear | Varies dramatically per tainted character |
| Key Mechanic | boss rush |
Strengths
- Highest skill ceiling with unique mechanics
- Each Tainted character demands a unique strategy — Tainted Keeper must spend coins to survive, Tainted Bethany uses soul hearts as spell charges, Tainted Jacob is chased by Dark Esau.
- Pairs well with Tech X
Weaknesses
- Steep learning curve, punishing mistakes
- Requires deep game knowledge to use effectively
Recommended Progression
- Start in Basement to learn Tainted Characters-specific mechanics
- Focus on boss rush — it's this build's primary system
- Prioritize Tech X as your first major upgrade
- See our full Tainted Characters build guide for the optimal gear progression
Which Build Should You Pick?
For Beginners
Azazel is the clear winner. It's forgiving, teaches core mechanics, and remains competitive into endgame. Follow our beginner's guide for the best first-session experience.
For Maximum Performance
Isaac is the top pick once you understand the game's mechanics. Pair it with Brimstone for the strongest overall setup.
For a Challenge
Tainted Characters offers the highest skill ceiling. It's punishing when misplayed but incredibly rewarding when mastered. Only recommended after you've completed the game with another build.
For Group Play
The Lost shines in cooperative content with utility and team support capabilities.
More The Binding of Isaac: Rebirth Guides
- The Binding of Isaac: Rebirth The Binding of Isaac: Rebirth Overview
- The Binding of Isaac: Rebirth Best Builds
- The Binding of Isaac: Rebirth Tier List
- The Binding of Isaac: Rebirth Walkthrough
- The Binding of Isaac: Rebirth Beginner's Guide
- The Binding of Isaac: Rebirth Tips & Tricks
- The Binding of Isaac: Rebirth Weapons Guide
- The Binding of Isaac: Rebirth Combat Guide
- The Binding of Isaac: Rebirth Boss Guide
- The Binding of Isaac: Rebirth Maps & Locations
- The Binding of Isaac: Rebirth Crafting Guide
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