Two sides

Jack is an anthropomorphic husky, having overall black fur with accents of white he has heterochromia due to a parasite that has taken over him the parasite is named Seth and they both share control of the body, when Seth is in control the eyes are red when Jack is in control the eyes are blue when they are both in control the right side is red and the left side is blue. Jack is overall really nice and a people pleaser, not really wanting anyone else to worry about him, Seth however, it's also really nice, but he's not as much of a people pleaser, he knows how to stand up for himself and he genuinely wants the best for Jack You know Jack being his host and all, if Jack dies Seth dies too, Seth being inside of Jack allows Jack to have enhanced strength mobility and the ability to summon tendrils that he can use to be lazy or protect himself, also if he needs to get himself or a friend out of a situation he gives control over to Seth who then sprouts wings and Darts away, sometimes immediately coming back to deliver a powerful blow. Also another neat detail, Seth being inside of Jack makes Jack's tongue really long for some reason, it can stretch up to 4 ft. Seth apparently came from an asteroid that crashed down on Earth and he's survived with multiple hosts but those hosts have never been humans because their bodies are too unstable for him, so he's only been able to possess animals sadly those animals don't really live long even though Seth adds 40 years to their lifespan, they are unfortunately not intelligent enough to communicate with Seth but perks are that Seth knows exactly what his host is thinking, and the host knows exactly what Seth is thinking so they can really annoy each other if they want to but the ability can be switched off.