Shortly after I resumed forcing after my 2-3 week pause, my Lethal appeared in human form during a short forcing session .I was using Dialogues' extended introduction hypnosis thingy, and at the part where he says your tulpa is sitting across the room from you, I saw her as a human first before I "auto-corrected" myself to seeing her as a pony, but I knew something was up: it wasn't the first time I thought of her as a human...
So I decided to make her a human form, a short girl about shoulder/neck height to me. For some reason I also thought it a good idea to give her an older adult form too, one much taller, with me around chin height to her, and I believed that her "soul" would remain the same whether she was currently in the young or adult form, but things didn't go according to plan.
Without thinking about it (too hard...), I started to associate her younger form being more energetic and lively, and her older form being caring, motherly, and oddly quiet, too. I occasionally switched between which form I would imagine her as, but the strange thing was that I switched from one form to the other because it felt right, not just because I wanted to balance out imagining each form; one form would begin to feel stale and unproductive, so I would imagine her in the other form. I also chose which form I imagined based on out I felt: if I felt happy and optimistic, I would imagine her in her young form, and if I felt sad, I'd imagine her adult form to comfort me.
Things began to generally feel dissonant and strange between Lethal and me, like I couldn't talk to or concentrate on her as well, if at all (I'm also pretty lazy when it comes to forcing, but this was different, I swear! ). So, a few days ago, I decided to imagine each of her forms as being independent tulpae, with my Lethal taking the young form, and Momma (that's honestly the first thought that came into my head) taking the adult form. Right after finalizing this decision, I felt VERY ecstatic and happy, like a huge burden had been lifted off my heart and mind.
So, as of this point, I have a mother-like tulpa (who I call Momma, at least for now ) and my Lethal as somewhat of a sister. The night after this happened, they were both quite talkative. Not that I can always understand what they're saying, but I've come to the point where I can feel when they're trying to say something. It's kind of strange, because sometimes I hear what they're saying as thoughts and words, and other times as feelings and impulses, but responses usually come instantaneously.
My Lethal has slowly evolved over the last 5 months since I began this tulpa journey, changing both her form and personality, becoming something unique to herself, radically different from how I originally planned for her to be, and I'm very proud of that fact. And now that I have a second tulpa, we've kind of become a small family of sorts! I know I haven't made nearly as much progress as others have made in this amount of time, but I recognize the progress that I have made so far, and I'm happy because of that.
So yeah, that's my progress so far.