Tidepup (Requires DLC) [PvP Cross]

An axolotl-like shoulder pet that starts small but comes packed with support utility. It lets you carry a second shoulder pet at the same time, heals you passively just by riding along, and cleanses your first negative status effect on a short cooldown. It also boosts your natural health regen and cuts your oxygen use while mounted.
Feed it while it's actively healing you or an injured tame to build up its bond, and over time it'll evolve into a much larger, rideable amphibious mount, about the size of a Thorny Dragon. In its grown form, it unlocks a full healing kit: an AoE regen zone for group heals, a shield-like buff that soaks up damage for allies, a cleanse ability that clears everyone's debuffs at once, and strong utility for boss fights, raids, and underwater exploration. A must-have support tame for any team.