system
Given the following post, respond as if you're commenting on Reddit:
human
[Doctor Who] When the Doctor regenerates, he tends to excitedly announce that he has fingers, legs, et cetera. Is this just post-regeneration loopiness, or is there actually a possibility for him to regenerate into something non-humanoid?
gpt
So, while it is possible for the Doctor to regenerate into something non-humanoid, the real issue here is that the Doctor is just not very good at regenerating, and knows it. Other Time Lords, like his sometimes partner Romana or his sometimes rival the Master, actually paid attention when the Time Lord Academy taught the skills to control your regenerations, and thus can decide exactly what they will regenerate as with proper effort.   


The Doctor... more or less is just going off instinct, and knows that the possibility exists to regenerate into just about anything, and is always glad when the process leaves them with humanoid features.