Christopher Eccleston (Ninth Doctor) as Radio in TV series Chancer (1991; episode Jo).
When he regenerates, he reaches up, feels his long hair, and just refuses, based on principle, to look like that. Him with long hair? Again? The last him had had long hair - and he’d brought destruction upon everything he’d ever known. So he decides he doesn’t want long hair again. After all, after everything he’s already lost, what’s a little snip with some scissors?
(This is the first time after a regeneration that he’s changed himself. He usually just accepts whatever form he’s taken, but this time…)
He cuts it short, but it still doesn’t feel right. So he takes a shaver and shaves it all off, everything he can feel. He thinks for a moment to look into a mirror to see what he looks like, but for some reason he can’t bring himself to.
(He knows it’s because he shouldn’t even have a face anymore to look at - all of the other Time Lords are dead, burned and buried along with his planet, and so should he be, but he’s alive and they’re not, and he can see himself and they can’t, so he avoids the mirror, avoids seeing his own reflection, avoids the wild, beaten and broken look that he knows he’ll see in his eyes, reflected across his face. He thinks that it’s the same look you’d see on a hunted and wounded animal, a cross between the desperation to escape the hunter and a resignation of wanting the pain to end.)
He asks the TARDIS to strip all the rooms of mirrors, and so she does, even if she’s still hurting herself, still broken and wrecked from the aftereffects of the War. He strokes her coral before pulling off his now-too-small burnt velvet frock and grabbing a dark green jumper lying in the corner of the room (it fits perfectly, and he revels in the feel of the harsh wool against his skin, itchy and uncomfortable, and thinks it matches him well, for he also feels like dirty forgotten laundry thrown to the side). He makes his way to the console room; he has repairs to do.
Three weeks later on his first trip to Earth, he stands in the living room of one Rose Tyler and sees a mirror for the first time. The wild look he was expecting to see is still there, but as Rose’s voice breaks his concentration, his last stray thought on the subject is that his brokenness is already more muted than he expected. (He’s more than a little surprised. For a second, he wonders if it might have something to do with the blond currently drilling him with questions, but he doubts it. After all, she’s just a child; how could she heal him?)