Hello Ragna <3 My sympathies for your mother, I pray that her treatment goes well. I lost my sister earlier this year to lung cancer, so I understand what sort of stress you must be going through, mentally and physically. Take care of yourself <3
As for RPing....
I love Sherlock and a love Molly Hooper, and something tells me that the Doctor is going to absolutely adore her, too. Whether she likes it or not. He's going to pester her every chance he gets, like a brother. If he had his TARDIS, he'd invite Molly to travel with him, no lie.
James Kirk - it's a good thing that Kirk is a sci-fi geek, because the Doctor would totally be familiar with Star Trek. Not so much the recent films (because er... his player hasn't watched them yet) but he is much more familiar with the old television show, and. Will Speak. To Kirk. In a. William Shatner voice. Because he thinks it's hilarious. Oh yeah, and the whole bonding over space travel thing, too... the Doctor really appreciates that. They may butt heads, because the Doctor considers himself an Alpha Male and may see Kirk as competition, albeit unconsciously. Irregardless, Kirk is the sort of person the Doctor wants at his side.