Okay, so, as a refresher, here's a rundown of all the characters we should know about from the first 13 episodes of the series, minus any of the minor human characters.
Images and info courtesy of
TFClub.
As these are some mild spoilers, here's a big gap of nothingness first to avert those who wish not to see this.
AutobotsOptimus PrimeDebut: Episode 1
Voice: Peter Cullen
BumblebeeDebut: Episode 1
Voice: Will Friedle
StrongarmDebut: Episode 1
Voice: Constance Zimmer
SideswipeDebut: Episode 1
Voice: Darren Criss
FixitDebut: Episode 1
Voice: Mitchell Whitfield
GrimlockDebut: Episode 1
Voice: Khary Payton
JazzDebut: Episode 10
Voice: Arif S. Kinchen
DriftDebut: Episode 12
Voice: Eric Bauza
Jetstorm (one of Drift's Mini-Cons)
Debut: Episode 12
Voice: Roger Craig Smith
Slipstream (one of Drift's Mini-Cons)
Debut: Episode 12
Voice: Roger Craig Smith
HumansDenny ClayDebut: Episode 1
Voice: Ted McGinley
Russell ClayDebut: Episode 1
Voice: Stuart Allan
DecepticonsUnderbiteDebut: Episode 1
Voice: Liam O'Brian
SteeljawDebut: Episode 3
Voice: Troy Baker
HammerstrikeDebut: Episode 3
Voice: David Kaye
BiskDebut: Episode 4
Voice: Khary Payton
Chop ShopDebut: Episode 4
Voice: David Hunt
TerrashockDebut: Episode 5
Voice: Kevin Michael Richardson
ThunderhoofDebut: Episode 6
Voice: Frank Stallone
FilchDebut: Episode 7
Voice: Constance Zimmer
N/ADebut: Episode 8
Voice: N/A
SpringloadDebut: Episode 9
Voice: John Steven Rocha
PedDebut: Episode 10
Voice: Eddie Deezen
QuillfireDebut: Episode 11
Voice: Andy Milder
FractureDebut: Episode 12
Voice: Kevin Pollak
Airazor (one of Fracture's Mini-Cons)
Debut: Episode 12
Voice: Roger Craig Smith
Divebomb (one of Fracture's Mini-Cons)
Debut: Episode 12
Voice: Khary Payton
ClampdownDebut: Episode 13
Voice: Jim Cummings