Interesting. Slight tw! for this.
1. It depends on the context. To give it a definition, someone who is a fan of anthromorphic animals and enjoys dressing as them or living like one. I do admit I sometimes overlap the term with otherkin (which I disagree with in all honesty), as in they believe to be an animal in a humans body(?), but I'll leave it at my previous statement for now.
2. Absolutely not. I have nothing against furries as a whole, but some parts of the fandom are just terrible, and I do not wish to associate with that in any way. Also, I don't think I could push myself to enjoy that sort of thing. Yes, I love animals, I always have since I could first think to myself, but it's more of a fascination and care for them than it is me wishing to become one or become like one (in a physical matter that is). I do draw animals, and most of my OCs are either animals, or humanoids with animal-like parts, but that does not make me a furry.
3. Almost all of them.
4. Honestly, if playing FeralHeart makes you a furry, then that means playing Overwatch or CSGO makes you a mass shooter, or if you play Skyrim it means that you're a dragon. No. Not even one bit.
5. Well, I'm currently enjoying a for-the-most-part leave from this game, but I loved the community, social environment, and the variety of possibilities of the game. RPG, chatter and adventure game all in one.