Here are the updates I’ve made to creatures based on playtesting and other observations:
Fox Constellation – Shifted the fox’s radiant immunity to resistance since there are no other creatures in all of 5e that have immunity to radiant damage.
Luchadore Playable Class – Nerfed the No-Sell feature a bit so it only works against melee bludgeoning attacks.
Tecuani – Adjusted the tecuani walking speed to 30 feet and its climb to 20 feet across the board. Also reduced the claw and bite damage to one die less.