Blitzwing not only has three modes (robot, jet, and tank), he also has three alternate personalities (an "Icy" cold strategist, a short-tempered "Hothead", and a total "Random" nutcase) along with the faces rattling around in his head to go with them. He's as liable to have a conversation with himself as he is to say a word to his fellow Decepticons. Pretty much the only thing that keeps him in line is that all three of his personalities are scared to death of Megatron.
Blitzwing's "dominant", Icy personality is represented by a long, blue face with a monocle and speaks with quiet disdain. His easily angered Hothead personality has a wide, red face, is gap-toothed, and tends to react angrily with violent threats towards almost anyone. Finally, his Random personality's face looks like nothing so much as a black jack-o'-lantern, and may toss out bad puns and jokes, children's nursery rhymes, or random non sequiturs, mostly followed by hysterical laughter. All three personalities speak with a pronounced German accent and apparently he has trouble flying in a straight line.
Blitzwing's armament varies depending upon which personality is dominant at the time. His calculating personality has an arsenal of ice weaponry, while the Hothead predictably can turn up the heat. When his third personality is foremost, nearly anything can be dished out from either of his vehicle modes. Blitzwing's alt-mode is likewise usually dependent on which aspect is dominant at the time. His cold side uses the jet, his angry side uses the tank, and his insane side can use either. However it seems that if he changes personality while in his alt mode, that alt will change with him, and if that's a jet to tank change, he'll fall right out of the sky.