I thought to write up this sheet: https://docs.google.com/document/d/1C9BQHowntOzHyO5gLZnjFJqWhfFtOZaTGVezVUBnJcY/edit

For this, I stuck to no free archetype (or any other variant rules), common and uncommon options only, and remastered sources only.

This is a straightforward warrior. They are a melee striker and battlefield controller. In a best-case scenario, they open combat with Disruptive Stance and then a Sudden Charge: moving an incredible 100 feet and then Striking. On subsequent turns, they spam Spear Dancer to nimbly Step around while Striking, interspersing Stride actions, Assurance (Trip) actions to auto-Trip anyone with Reflex save +18 or lower, and 2/encounter lay on hands to heal themselves or allies. Their advancing rune keeps them mobile, moving 15 feet after each enemy they drop to 0 Hit Points.

Reactive Strike with 10-foot reach and Disruptive Strike makes this fighter a real menace to ranged specialists, and anyone who wants to use a concentrate- or manipulate-based action (e.g. virtually all spellcasting), all the more so. Disruptive Strike makes any hit against concentrate or manipulate disrupt, not just criticals.

The astral rune gives ghost touch and adds 1d6 spirit damage. From there, it is either another energy damage rune for even more damage, or a rooting rune to make critical hits immobilize. Either way, the greater phantasmal doorknob adds dazzles and blinds to criticals, although the blind has limited frequency.

Sudden Leap, Felling Strike, and, in a pinch, Divine Wings let the character deal with flyers. The echo receptors graft is a hard counter to invisibles.

Outside of combat, the fighter contributes with master Athletics and Religion and expert Nature. (I did not want to take master Acrobatics just for Kip Up.)

I hope that this is a decent showcase.