I have one tulpa I made 5 or 6 years ago. She's a Unicorn and she used to be a Twilight Sparkle knockoff before becoming her own pony Unicorn with her own name and looks. But recently, she's been thinking of redesigning her body and abandoning her ponyness, replacing it with some other animal nature. Maybe even designing a human body.
She's a living idea, and we aren't sure what effect redesigning her body will have on her. She's afraid her pony body is limiting her and she's lost her love for ponyness. She once went through a stage where we pretended she's some kind of magic quantum spirit from another dimension with her own pony world memories, but she stopped doing that after a few months of being alive.