Does being a triple-changer means a ‘bot has multiple personalities? I’m asking because TFA Blitzwing’s vehicle modes seem to be related/connected to his different personalities/faces.

tfwiki:

This is just an Animated thing. Blitzwing wasn’t always like that – undergoing the Triple Changer conversion process (administered by Blackarachnia) did it to his mind. If the show had had a fourth season, this story would have been told in some more detail, and Megatron would also have been rebuilt into his own triple-changing “Marauder” body, with some side-effects:

“Triple Threat”
In his new triple-changer mode, Megatron proceeds to ruthlessly obtain energon.  Unfortunately, the triple-changer mode has given Megatron a bit of an unstable personality to match, a one-bot army blowing away anything and anyone in his path.
 

Presumably, being Megatron, he’d have gotten control of himself by the end of the episode, but who knows?