The Anchor and The Emotional Conductor
These are general tendencies, not rules or predictions. People are more than their structure.
How they meet
Both of you are the person others come to. The Anchor steadies the room. The Emotional Conductor feels the room, and carries it home afterwards.
What tends to work
The Emotional Conductor notices what someone is feeling before it is said, and The Anchor makes it safe to say it. Together you are very good at looking after other people. The Anchor's steadiness also gives The Emotional Conductor somewhere to put things down.
Where it strains
The Anchor can become the one who always holds, and The Emotional Conductor the one who is always held. The Anchor's calm can look like not feeling much. The Emotional Conductor's intensity can leave The Anchor quietly tired and not saying so.
What helps
Ask each other the question you both ask everyone else: "how are you, really?" The Anchor can say when they are running low. The Emotional Conductor can take time alone without it meaning something is wrong.