Long Version:
Similar to how dyes work, I’m suggesting new character animation styles via the use of a consumable that would be non-binding and purchased through the Black Lion store for a reasonable amount of gems. These consumables will unlock a full themed set of animations and include an out-of-combat idle, combat stance, run/walk and jumping animations (perhaps a sitting pose as well) each of which could be mix-and-matched with other styles. Animation settings could be added as a side tab to the Hero screen and the tab would, like the dye screen, show a preview of the selected animation or perhaps a preview button for each animation type.
Short Version:
Title.