Here's some optional mounts id like to see besides Chocobos.

Coblyns / Doblyns - Coblyn <3
Antelope - lol idk why but its blue & looks wierd.
Aldgoat - not the most obvious choice but looks potential lol
Hogs - If anything screams mount it's these bad boys.

Id also like to add mount feature suggestions to my post.

Minor stats & Mount gear menu. (to customize your mount)

Optional Armor / Mount Gear.
- mounts gotta have some bling bling, example: Collars, mount seat, head armor et.

Optional mount color settings.
- And i dont mean Neon green etc... but something normal maybe.

but... id settle with chocobo mount only aswell i guess.