Linnies do seem to be uncommon. I had never heard of them until I called a breeder to see if he had a hand fed budgie. He did not but told me about his Linnies. I bought Gigi from The Parrot's Nest in Hampstead. Great place full of healthy happy birds. Maybe you bought Rascal there?
Gigi does not say any words but has dozens of trick whistles and sounds. She does a "wolf whistle" and "come here dog whistle" as well as the first 5 eerie notes from A Fist Full of Dollars, lol. She also does many versions of kisses, lasers, buzzes and beeps. Some are quiet but super clear and cute. She does contact calls to me if she wants something (slant the blinds, the sun is on me) and when I answer she replies with a much different sound. It's amazing and I feel like we really communicate.
Gigi is fully flighted and lands on me often when she is out of the cage. She hangs out on my shoulder or lap, sleeping and preening. I can say "I want that bird right here" while tapping the sofa arm and she usually flies there. She is super friendly and interested in me, friends and family. But as
@Leih said, she can be crazy territorial about her cage, toys and play gym and now a section of the sofa that has a little hidey spot, lol. She might shriek or lunge if I do mess with her stuff, but very seldom does she nip. She would rather I not touch her in normal circumstances but will easily step up when I take her to have her shower or if she ends up somewhere unusual. She's a funny girl but I am figuring her out and letting her call the shots.
. She seems very happy and we really love her.
I have had many birds in the last 40 some years but Gigi is now my only. No other pets.