Vee / Lori / Karen (24 episodes, 2010-2011)
Koko (US) / Koko (21 episodes, 2010-2012)
Koko (UK) (20 episodes, 2010-2012)
Wilson (US) (19 episodes, 2010-2012)
Brewster (US) / Wilson (US) (18 episodes, 2010-2012)
Wilson (UK) (19 episodes, 2010-2012)
Brewster (UK) / Wilson (UK) (19 episodes, 2010-2012)
Emery (US) (10 episodes, 2010-2011)
Emery (UK) (10 episodes, 2010-2011)
Vee (US) (10 episodes, 2010)
Lori (US) (7 episodes, 2010-2011)
Mtambo (UK & US) (5 episodes, 2010-2012)
Toot (US) / Hoot (US) (4 episodes, 2011)
Hoot (UK) / Toot (UK) (4 episodes, 2011)
Toot (UK) / Hoot (UK) (4 episodes, 2011)
Hoot (US) / Toot (US) (4 episodes, 2011)
Old Puffer Pete (3 episodes, 2010-2011)
Old Puffer Pete (US) (3 episodes, 2010-2011)
Olwin (UK) (3 episodes, 2010)
Olwin (US) (3 episodes, 2010)
Hodge (US) (1 episode, 2010-2011)
Hodge (UK) (1 episode, 2010-2011)
Storm Maker Machine (UK) (1 episode, 2010)
Eddie (UK) (1 episode, 2011)
Mr. Mistereoso (UK) (1 episode, 2011)
Eddie (US) (1 episode, 2011)
Action Chugger (UK) (1 episode, 2011)
Zephie (UK) (1 episode, 2011)
Zephie (US) (1 episode, 2011)
Action Chugger (US) (1 episode, 2011)
Passenger (UK) (1 episode, 2011)
Dunbar (UK) (1 episode, 2012)
Dunbar (US) (1 episode, 2012)
Calley (US) (1 episode, 2012)
Calley (UK) (1 episode, 2012)
Frostini (UK & US) (uncredited) (1 episode, 2010)
Dr. Ling (UK & US) (uncredited) (1 episode, 2011)