A

• [+] Aliens
• [+] Animated characters

B

• [+] Beast Era characters

C

• [+] Characters without visuals
• [+] Children of Primus
• [+] Combiners
• [+] Crossovers characters

D

• [+] Dimension hoppers
• [+] Double agents
• [+] Drones

E

• [+] European-original characters

F

• [+] Fiction-only characters

F cont.

• [+] Functions

G

• [+] Gender-switch characters
• [+] Generation 1 characters
• [+] Go-Bots franchise characters
• [+] Gods

H

• [+] Humans

J

• [+] Japanese-original characters

K

• [+] Kansai characters

L

• [+] Letters page answerers

M

• [+] Matrix bearers
• [+] Movie characters

N

• [+] Nameless characters

R

• [+] Return of Convoy characters

R cont.

• [+] Robots in Disguise characters

S

• [+] South American-original characters
• [+] Subgroups

T

• [+] Timelines characters
• [+] Toy-only characters
• [+] Transformers
• [+] Transtech characters
• [+] Turncoats

U

• [+] Unicron Trilogy characters
• [+] Unicron-related characters

V

• [+] Video game-only characters