When in-game, characters are structured as following. Each tree assumes the player is wearing a shirt, T-shirt, and pants, but no accessories.
R6:
CharacterModel
Head
Mesh
HairAttachment
HatAttachment
FaceFrontAttachment
FaceCenterAttachment
GettingUp
CharacterSoundEvent
Died
CharacterSoundEvent
FreeFalling
CharacterSoundEvent
Jumping
CharacterSoundEvent
Landing
CharacterSoundEvent
Splash
CharacterSoundEvent
Running
CharacterSoundEvent
Swimming
CharacterSoundEvent
Climbing
CharacterSoundEvent
face
Torso
roblox
NeckAttachment
BodyFrontAttachment
BodyBackAttachment
LeftCollarAttachment
RightCollarAttachment
WaistFrontAttachment
WaistCenterAttachment
WaistBackAttachment
Right Shoulder
Left Shoulder
Right Hip
Left Hip
Neck
Left Arm
LeftShoulderAttachment
LeftGripAttachment
Right Arm
RightShoulderAttachment
RightGripAttachment
Left Leg
LeftFootAttachment
Right Leg
RightFootAttachment
Humanoid
StatusAnimator
HumanoidDescription
HumanoidRootPart
RootAttachment
RootJoint
Sound
LocalSound
Health
Animate
idle
Animation1
Weight
Animation2
Weight
walk
WalkAnim
run
RunAnim
jump
JumpAnim
climb
ClimbAnim
toolnone
ToolNoneAnim
fall
FallAnim
sit
SitAnim
ScaleDampeningPercent
Body Colors
Pants
Shirt
Shirt Graphic
R15:
CharacterModel
HumanoidRootPart
RootRigAttachment
OriginalPosition
OriginalSize
LeftHand
LeftWristRigAttachment
OriginalPosition
LeftGripAttachment
OriginalPosition
LeftWrist
OriginalSize
LeftLowerArm
LeftElbowRigAttachment
OriginalPosition
LeftWristRigAttachment
OriginalPosition
LeftElbow
OriginalSize
LeftUpperArm
LeftShoulderRigAttachment
OriginalPosition
LeftElbowRigAttachment
OriginalPosition
LeftShoulderAttachment
OriginalPosition
LeftShoulder
OriginalSize
RightHand
RightWristRigAttachment
OriginalPosition
RightGripAttachment
OriginalPosition
RightWrist
OriginalSize
RightLowerArm
RightElbowRigAttachment
OriginalPosition
RightWristRigAttachment
OriginalPosition
RightElbow
OriginalSize
RightUpperArm
RightShoulderRigAttachment
OriginalPosition
RightElbowRigAttachment
OriginalPosition
RightShoulderAttachment
OriginalPosition
RightShoulder
OriginalSize
UpperTorso
WaistRigAttachment
OriginalPosition
NeckRigAttachment
OriginalPosition
LeftShoulderRigAttachment
OriginalPosition
RightShoulderRigAttachment
OriginalPosition
BodyFrontAttachment
OriginalPosition
BodyBackAttachment
OriginalPosition
LeftCollarAttachment
OriginalPosition
RightCollarAttachment
OriginalPosition
NeckAttachment
OriginalPosition
Waist
OriginalSize
LeftFoot
LeftAnkleRigAttachment
OriginalPosition
LeftAnkle
OriginalSize
LeftLowerLeg
LeftKneeRigAttachment
OriginalPosition
LeftAnkleRigAttachment
OriginalPosition
LeftKnee
OriginalSize
LeftUpperLeg
LeftHipRigAttachment
OriginalPosition
LeftKneeRigAttachment
OriginalPosition
LeftHip
OriginalSize
RightFoot
RightAnkleRigAttachment
OriginalPosition
RightAnkle
OriginalSize
RightLowerLeg
RightKneeRigAttachment
OriginalPosition
RightAnkleRigAttachment
OriginalPosition
RightKnee
OriginalSize
RightUpperLeg
RightHipRigAttachment
OriginalPosition
RightKneeRigAttachment
OriginalPosition
RightHip
OriginalSize
LowerTorso
RootRigAttachment
OriginalPosition
WaistRigAttachment
OriginalPosition
LeftHipRigAttachment
OriginalPosition
RightHipRigAttachment
OriginalPosition
WaistCenterAttachment
OriginalPosition
WaistFrontAttachment
OriginalPosition
WaistBackAttachment
OriginalPosition
Root
OriginalSize
Humanoid
Animator
BodyTypeScale
BodyProportionScale
BodyWidthScale
BodyHeightScale
BodyDepthScale
HeadScale
HumanoidDescription
StatusHead
Mesh
OriginalSize
FaceCenterAttachment
OriginalPosition
FaceFrontAttachment
OriginalPosition
HairAttachment
OriginalPosition
HatAttachment
OriginalPosition
NeckRigAttachment
OriginalPosition
Neck
OriginalSize
face
GettingUp
CharacterSoundEvent
Died
CharacterSoundEvent
FreeFalling
CharacterSoundEvent
Jumping
CharacterSoundEvent
Landing
CharacterSoundEvent
Splash
CharacterSoundEvent
Running
CharacterSoundEvent
Swimming
CharacterSoundEvent
Climbing
CharacterSoundEvent
Sound
LocalSound
Health
Animate
cheer
CheerAnim
swimidle
SwimIdle
dance
Animation1
Weight
Animation2
Weight
Animation3
Weight
dance2
Animation1
Weight
Animation2
Weight
Animation3
Weight
dance3
Animation1
Weight
Animation2
Weight
Animation3
Weight
run
RunAnim
climb
ClimbAnim
fall
FallAnim
laugh
LaughAnim
point
PointAnim
sit
SitAnim
toollunge
ToolLungeAnim
toolnone
ToolNoneAnim
toolslash
ToolSlashAnim
wave
WaveAnim
ScaleDampeningPercent
walk
WalkAnim
jump
JumpAnim
swim
Swim
PlayEmote
idle
Animation1
Weight
Animation2
Weight
pose
LevitationPose
Weight
Body Colors
Pants
Shirt
Shirt Graphic