CG! Tenth Doctor Headcanons *ੈ✩‧₊˚
A bit more invested in the concept of regression, but equally supportive
He asks you a lot of questions about it, in that way only The Doctor can
"you said you feel like a kid? What age? Is there an age or is it more of a nebulous feeling? It varies by person, you say? And even within individuals? Fascinating!"
"Oh, the Tardis is going to just love you - it's been quite some time since she's had a child in her care, you know."
Will still take you on adventures obviously, but he's probably a bit more controlled about it
"Now now, time for a nap. We can go see New New Orleans afterwards. You're going to need the energy!"
Better at distinguishing what age you feel, whether you're a toddler, kid, teen, etc
Honestly he's probably the most adept at it out of all of the doctors
Lets you play with his sonic but will forget to tell you what buttons not to press and have to rush to stop you before you accidentally set something on fire
And then he'll accidentally set something on fire demonstrating what that button does and why you should absolutely not press it
Also loves being a dad to you, he's so happy about it
Nose nuzzles, will pick you up and swing you around if possible (will bring you to planets with less gravity just to do this), lots of jumping and bouncing and silly noises
Lots of running around too, he'll chase you around the Tardis console listening to you giggle and laughing his head off as well
Would probably habitually introduce you as his kid at least once or twice, and keep doing it if you like it
There's probably a planet specifically for littles that he knows about but has never had a reason to visit before
And he is so excited now to get to go somewhere new AND show it to you too, especially since it's made for you!
Will dress you up like him if he's allowed to lol
Both in general styles ("nooo those shoes won't work here! I've gotta have something... aha! C'mon try these" and it's a pair of old converse like his)
And in the sense that he will absolutely find/get you matching outfits
The Tardis can make practically anything so
Kid suits matching his (they're your size but made to fit like it would for a kid), onesies with the same patterns, etc
Calls you his little astronaut, buddy, bud, kiddo, star, and starlight
Along with Gallifreyan stuff ofc
You get star projectors in your room that show stars from different planets and galaxies
And he'll tell you all about them and about the planet you're seeing them from
Once again lots of praise, I think that's a trait shared between all the doctors
"Brilliant! You're brilliant! Oh, my clever little star! You've solved it!"
Especially if you end up figuring out what's going on with the problem of the week lol
Tells you crazy bedtime stories about his adventures
Loves being able to say yes whenever someone asks if he has kids