Martial that focuses on teleportation?
As it says on the tin. Obviously plenty of casters can do this sort of thing; particularly a certain brand of psychic; but is there a good way to unlock this sort of mobility option as a consistent gimmick on a Martial? Starfinder2e Classes may be included in this discussion I will say. Psychic archetype into unbound step helps a bit; though it takes a while to get enough focus points to do it consistently. There's also shrink the span with monk. Though I'm not sure if it's possible to get something more at-will for shorter distances.
Edit:At a glance our main ticket here based on the responses is (1)-Gap-Touched! Grab the various short-range one action teleport feats from that (2)-Either grab Monk for Shrink the span, or Shadow Magus for dimensional assault and (3)-Grab a thaumaturge archetype to get the mirror at level 6 giving you a way to teleport a decent distance at will (If as 2 actions). Will have all you need for a flickering boy by level 6~ or so.