Well, most biaks are rather tempermental. Also biaks are the largest of the GTPs iirc. They also dont necessarily turn full green. Some keep a lot of yellow, some more green, some a mix of both. With biaks, you just never know which is why i see a lot of people liking to mix biaks into breeding projects.
Not sure why Pat is so laid back but i wont complain lol. I've seen other people with really mellow biaks too. I personally think each snake is going to have its own temper and it also helps if you raise them in a nonstressful environment where the snake doesnt really have to worry much. Like i said, i interact with all my snakes a lot, not necessarily taking them out of the cages and parading them around 24/7 but i always leave a door open when im around and pet them and stuff when i change water. So they always have some sort of interaction unless they are in a hide, then i leave them alone unless they willingly come out to say 'hi' lol.
Plus sometimes, certain ones want more interaction time. Rosey recently has really been wanting the attention where she was pretty much content with being in a hide and quiet for past couple months. You learn to read them after keeping them for a long time.