murmur after his first canon death
he's so big and looks more animal-like because at the exact moment he died, he turned into his "regular ram" form (as seen on his reference sheet) which led to him merging with it during respawn
that made him more serious, calm, more human
isn't it ironic
at this point yuri would be more like a boss or a master than a father figure to him
also he grew like 10 inches