Barbarian

Ancestral Guardian

Source: Xanathar's Guide to Everything

Battle-Rager

Source: Sword Coast Adventurer's Guide

Beast

Source: Tasha's Cauldron of Everything

Berzerker

Source: Player's Handbook

What to Expect

Playing as SUBCLASS

What would DM Darwin Change?

2024 Revision Available

Fractured

Source: Grim Hollow Pg 39

Barbarians are defined by their rage, channelling emotion to unleash brief but potent destruction on their enemies.
A rare few study esoteric psychological techniques that split their rage off from the rest of their psyche, dividing their identity into two parts: ego and id.
When their ego is in control 'the Fractured'; as these barbarians are known, are capable of a degree of self-control and cunning few other barbarians are. When they allow their id to take control, their countenance turns monstrous and their bodies swell with the power of rage made physically manifest

Player Story Tips & Ideas Players should consider some sort of split personality trait similar to Jekel & Hyde or the Hulk. Their rage form being a different personality to their regular selves.
Players should also consider how the character got this particular sub-class. experiment gone right or wrong? curse? blessing? etc.

What to Expect Players can expect to gain separate lines of features for when they are in rage and out or rage. The theme of Jekale & Hyde or Hulk. Gaining bonuses on Unarmed attacks rather than weapon attacks.

What would DM Darwin Change? As a Barbarian, you always want to be raging while in combat. so combat benefits you get while not raging seem kind of pointless.
I would change 'Brains & Brawn' to give non-rage an advantage on some social or exploration skill rather that Psy Resistance.
and changing 'Cunning & Brutal' to be able to give an alley some sort of social or Exploration bonus while non raging rather than being able to Disengage/Help as a bonus action when NOT raging.

Giant

Source: Bigby Presents: Glory of the Giants

Haze-Rager

Source: Guide to Drakenhime, Pg 150

Old Gods

Source: Guide to Drakenhime, Pg 151

Primal Spirit

Source: Grim Hollow Pg 40

Many barbarians are in tune with the natural world, but few are as mystically intertwined with it as those who walk the Path of the Primal Spirit.
These barbarians forge powerful connections with the beasts and natural spirits of the world, inspiring such ethereal beings to manifest and journey with them on far-flung adventures. Barbarians who follow this path have a deep reverence for the ecological cycle of the natural world. Such barbarians are as likely to accept quests and pleas for aid from local wildlife as they are other humanoids.
This respect for animals doesn’t cross into naivety—no barbarian better understands the circle of life and the delicate balance between the needs of predator and prey better than those who walk the Path of the Primal Spirit.

Player Story Tips & Ideas Players can fit any simple Hunter, Tracker, Wilderness explorer, lone-wolf ideas into this subclass. Anything that may fit a Ranger or Druid may also work here. Maybe the character is part of a Ranger conclave or a Slayer (Hunter of Monstrosities).

What to Expect Playing a Barbarian but you get a cool Beast Companion with a variety of forms that Rages alongside you, Gaining benefits with level ups.

What would DM Darwin Change? Let the player command the beast companion as part of entering a Rage as well as a Bonus action, This means the player dosent have to wait a turn to rage then next tur command their beast companion.
'Kin to Beasts'
Let spells be cast a number of times equal to half proficiency bonus, Gives the player more leyway to use these free spells rather than constantly saving their single use per rest.
add the ability to have two primal spirits at the same time and be able to command both with entering a rage & Bonus action. Whats better than one hunting companion? two.

Storm Herald

Source: Xanathar's Guide to Everything

Wild Heart

Also Known as Totem Warrior

Source: Player's Handbook

2024 Revision Available as Wild Heart

Wild Magic

Source: Tasha's Cauldron of Everything

Witch

Source: Hexbound, Pg 49

World Tree

Source: 2024 Player's Handbook

Zealot

Source: Xanathar's Guide to Everything

2024 Revision Available