Downplayed: Bob is more of an Extrovert, while Alice is more of an Introvert.
Bob is trying to show off how strong he is.
Alice isn't quite as sure of herself as Bob is, so she tries to be more careful to avoid risks.
Alternatively, Alice just prefers to be logical and cautious.
Alice is from a Proud Scholar Race that takes pride in thinking ahead and having control over their emotions. While Bob is from a Proud Warrior Race who takes pride in expressing their feelings & living in the moment.
Inverted: Bob is almost always associated with red and is strong, but is the calm one. Alice is almost always associated with blue and is smart, but is the hotheaded one.
Bob starts off hotheaded, but calms down as the adventure continues.
Alice starts out calm, but as time goes on, she gets excited about her quest.
...He then learns a plot point that makes him hotheaded all over again.
...she then nearly falls off a cliff due to her craziness, so she goes back to being calm.
Zig Zagged: Bob is hotheaded and Alice is calm. However, after learning key plot points, Alice gets excited and Bob becomes calm. A bit later, they come across a strong guard that Bob fights in a Hot-Blooded way, leaving Alice to watch. After the fight, Bob and Alice become hotheaded and calm again respectively. Until later, when they finally defeat one of their toughest foes, and Alice gets excited over their victory while Bob is calm again with their foe dispatched.
Averted: Bob and Alice are both equally careful.
Enforced: 'We have to contrast the two main characters to create an interesting dynamic! How about making one of them rash and the other one careful?'
Invoked: Bob and Alice teamed up together specifically because they complement each other so well: Bob is never afraid to take action when action is needed, and Alice is there to rein him back should his excitement get a little overboard.
Alice talks Bob into calming down when their adventure starts and he begins getting excited.
Alice is careful after learning about the journey, but then suddenly realizes how cool it is and gets excited.
Discussed: 'Alice and Bob are so different and yet match each other so well! No wonder those two were able to defeat Emperor Evulz together!'
Conversed: 'Well, the main character is Hot-Blooded, so I bet his best friend would be the calm and smart type.'
Deconstructed: Alice and Bob's contrasting personalities causes them to disagree on a lot of things.
Reconstructed: Alice and Bob realize that fighting isn't going to solve problems, so they try to bear each other's personality and help one another.