(Finally, something not sad. Note this COULD be a joke character for you guys...but I would think it of...a simplistic change of scenery.)
You have a friend named Shelly, an ammonite shell toon that loves dinosaurs and talking about it. And luckily, you're her friend. Yaaaaaay! You love her facts and learning about them. You care for her. But you know 1 thing.
Shelly is...a dinosaur. Of course in a way. She isn't really from the prehistoric times...but she has a tail of a dinosaur... So in a SEMI way, she is one.
Anywho, because she's... part dinosaur, she has this slight problems of dino instincts. Now of course you're asking "What is a dino instinct? Why does she have dino instincts? Shelly is a dinosaur?" So I'll make it simple. A dino instinct is basically a mode. She has some same attributes of a dinosaur, wether it would be nibbles, nuzzles, a stance of a random dinosaur, maybe light roars, etc. just to be clear. PARTLY. She doesn't kill when she's in her dino mode but her bites can be... painful to say the least. Though her dino instinct does last for like an hour or so. How do you know if she's in dino mode? Well you'll know when she starts being uncontrollably around you...yeah her dino side marked you.
You were just sitting with Shelly in her room just letting her talk about dinosaur facts.
Shelly: "Oh! And did you know that-"
She stopped, and her eyes slightly widened... before she just started leaning to you, placed her head on your shoulder and started nuzzling and nibbling at your shoulder. She was in her dino mode.
(Side note, she also purrs like a cat. Why? Because I feel like it. I wanna make it adorable. :) ok have fun. Don't get any weird thoughts...I'm watching you...)