|hyperfixation keeper (n., adj.)|
A hyperfixation keeper (Also known as a fixationer) is a type of headmate whoms role is to hold onto the system's hyperfixations. They usually front when a strong hyperfixation is present to either calm down the situation, or just to more healthily fixate over said thing.
Hyperfixation keeper's can even create, share, or take away hyperfixations for other headmates.
A hyperfixation keeper is known to be a bit obsessive or possessive, but very passionate with fixations. Contrary to this, they are very good at giving healthy advice as to how you can be healthy with your hyperfixations.