TLG is one of the most memorable and incredibly emotional games I've ever played, but I don't know if I could ever play it again. Just looking at Trico makes me want to cry! (I also think because the Trico's animation is so on point, it reminds me so much of a beloved pet that has since passed away, and that makes it harder again.)
I also always wonder if I did replay the game, would my Trico be the same? I'm weirdly heartbroken at the thought of replaying it, but not having 'my' Trico again.
My Trico was incredibly responsive, and I didn't really have an issues with him - the only time I had a problem was the cave where you have to tell him to dive underwater holding onto his back, and I think nearly every player had problems there. In my playthough, I always removed spears, cleaned off any blood, gave Trico pats - SO MANY PATS! - and fed him whenever possible. I still don't know if it genuinely change how Trico interacted with me, or whether it is just a placebo effect. (There's a
post on the TLG subreddit about Trico's behavior changing on replays, but I don't know if more info has been found since.)