The Warlock/Other Doctor/War Doctor
He has some nice stuff. His costume is very cool.
Little bit disappointed in his sonic though. Just a little. Was excited at first because it had a red light on the end, and you know how much I like red things. (Apparently someone didn’t though so maybe I can’t say that any more? I dunno.) It also had a red bit on the butt-end, and that was new. However, upon closer inspection, it is literally the Fourth Doctor’s Sonic with the head pulled off and a wee red LED stuck in instead. So, okay, still pretty cool, but I was hoping for a new prop and it wasn’t. Or at least a new head.
His TARDIS console room though! Oh! Technically not new either, but it bridges the new and the old wonderfully. I imagine that the Eighth Doctor’s console room was - regrettably - destroyed completely at some point so the Doctor switched back to a room with roundels. But the damage to the TARDIS continued so out crept the organic scaffolds to hold everything together.
But my favourite detail from that TARDIS console room was that the console itself - whilst being obviously the same console - was much, much younger. Nine’s console and sonic both had parts that were made to look like some sort of ceramic/porcelain type material, but old and cracked. Here however we have the same edge to the console, only it’s clean, pure white. It’s new and young. So between the Last Day of the Time War - in which the Doctor regenerates into Nine - and Rose a lot of time has passed. Not long enough for the scaffold (coral-structures) to become no longer necessary, but long enough for the coral to really fill out and settle and grow old, but also for the porcelain material to age and develop imperfections. (Not helped by the use of percussive maintenance.) So judging by the coral and the ceramic and the general state of the walls and floor, it looks like decades pass between The Day of the Doctor and Rose. If not a hundred years. Which is supported in the dialogue, I think.
(“How old are you now?”
"1200-ish. Unless I forgot, or I’m lying."
“400 hundred years older than me!”
The Warlock thinks he’s 800-ish. 100-ish years younger than Six.)
(Also, Night of the Doctor gives us a possible loophole for the regeneration-limit, and since the War Doctor doesn’t think it is odd that the Tenth Doctor seems to think he’s only 900 years old then I’d suggest that perhaps the Doctor has been counting his age from the night that Eight died for Cass and chose to become the War Doctor.)