Should it be a Crocodile/Alligator, let its Unique attack be a Death Roll, basically a charged attack that Grapples you and Charges in 2 Moves, failing to escape could Damage your Stamina with a Massive amount.
But we already have a Gruff, Violent, and Possibly, toxic relationship which might be Arlene... so making a Character heavily based of how they act in real life might work better.
Shy, Quick, Effective, and Likes Groups but Disallows Relationships.
They are social, but Aromantic,they group up, has high tolerance but will still attempt to gain a bit of Isolation.