I love them all, but each has their quirks. Christopher, our B&G, can be naughty and unpredictable. She likes to try to sneak up on me and bite me when I'm doing something with her cage and she gets furious if I touch her toys. Then we have Sandy, the B&G at the store. She loves me, but she's also cranky. She can be very sweet with me but sometimes I have to take a tone with her before she gets herself under control. Generally, she's a sweet bird, but she's also very old and not always comfortable so I give her some latitude.
I breed green wings and they are so much fun. Over the last few years, we've had Freya, Enzo, and Bo. They all have different personalities but generally, they are easygoing and affectionate. Freya was very serious and focused as a chick and when I see her now I still see the same attitude. Enzo was silly, easily distracted, and insecure but full of love. Bo is silly and demanding, and she can be loud, but she's a total cuddle bug. She's also a little under the weather at the moment so I give her a lot of leeway too when she's cranky. We have one adult green wing at the store. He was taught to play very rough so his personality is very in-your-face and demanding. He's quick to nip or pinch and has to be constantly reined in or he gets out of control. They all have big personalities but can be gentle and sweet.
My scarlet, Poppy, can be playful, but she can also be a complete witch with very little effort. She bites for her own entertainment. It's not to break the skin, but it's a hard pinch. I think before she used to get a dramatic reaction out of her owners and she thrived on it. Now when she bites me she finds herself on the floor with me sternly telling her that's not going to work on me. It has worked to curb it some, but she still tests me at every opportunity. I've found that scarlets are very much a product of their upbringing. A male scarlet that we had at the store for several years was never taught what would be considered appropriate behavior. His owner was an employee and he lived at the store because she wasn't in a place where she could keep him. He thought nothing of throwing himself at women who walked by and hanging off the back of their heads by their hair. He was basically allowed to do what he wanted. The owners moved, got married, and had a baby. Before the baby came along he still did what he wanted and would bond with various people in the house for short periods of time before he moved on to someone else. It was all fun and games until he went after the newborn and ended up back at the store. I blame the owner more than the bird. In general, I've found scarlets to be tricksters that will test you every chance they get and unless they receive consistent training with set expectations they will run wild. Even with consistent training, they will still test you to see what they can get away with.
My boy Chewie is a ruby so he has personality traits of both greenwing and scarlet. I'm pretty sure his father was the scarlet. He has that trickster personality that is very forward, but I also see the gentleness of the greenwing showing through. He wants to have fun and be silly, but he also wants to be a cuddle bug and just chill with me.
I see some general things that are similar for each species, but it's hard to say exactly that this species always has these specific personality traits. Each bird is different and a product of their environment. I think training is everything.