Just came up with this. I'm sure something similar must have been done before, but here it is, nevertheless. There's a few (eg Victoria) I'm not too happy with, but meh, it's a first draft. A few of the points are rather arcane, so feel free to ask if you're confused at where they've come from...
What your favourite tube line says about your character:
Central: You prefer to take things in different directions to others. You prefer a solution employing the newest technology over a less effective one based on more basic principles. When something isn't working for you, you'll drop it, as soon as sentiment allows; but you see great potential in things other people think are worthless. You feel the heat, but can always take it.
Waterloo & City: Simplicity is key. Purity of solution is more important than effectiveness. Things should be made for one purpose and one purpose only, and be optimised for that. On the other hand, if someone's already made something that meets your needs, you'd rather use that than reinvent the wheel. You prefer to stay apart from the crowd if you think you have a better way, but are willing to join them when your needs align.
Bakerloo: You highly value tradition - and the colour brown. Even when something's broken, you prefer to repair it than start afresh. If someone else comes along who can make better use of what you have, you'd be happy to give it up. You believe there's no reason anyone would need to go to Watford. You're happy with what you have and don't ask for more.
Northern: You think outside the box. While others agonise between two options, you decide to do both. You believe that it's important to spend money to make money. You hope to get so successful that you can sell off part of your enterprise for a huge profit. You don't mind so much about appearances, but are willing to put the effort in when it'll help you get what you want. You're above all an innovator - you came up with the ideas that everyone else is now taking for granted, and you're not afraid to take risks when the payoff is good.
Victoria: Speed is always of the essence. You like being a middle man. You believe in the importance of proper enunciation. You're quite a modern person, but look back with respect on figures of the past. You're practical and overall quite plain in appearence but indulge yourself here and there. You believe that every labourious job will soon become obsolete due to automation.
Jubilee: You take things other people have failed to make work and go off in a different direction with them. You're not afraid to abandon something you worked hard on if a better opportunity arises, though you like to keep it around just in case. Everyone is surprised at your success and yet wonders how they managed to live without you. You think it's worth spending a little more on something to improve the aesthetic, even with no other purpose.
Piccadilly: You also like to make best use of old things, but unlike some aren't hampered by tradition - you're perfectly willing and able to push tried and tested technologies to get yourself ahead of others using the latest designs. But you recognise that nothing lasts forever and it will eventually be time to start afresh. You're happy to share with others to make life better for both of you, but you always let them have priority when there's a problem. You're always looking for new partners. You can be a little slower than others when working, but you believe this is just because you're more thorough, which is why people like you.
Metropolitan: You have delusions of grandeur which are slowly fading as you realise the harsh reality of your situation. You remain stubbornly independent until forced to conform. You always remain cool no matter what you're exposed to. You will abandon former friends and make enemies if it'll get you ahead. Once you were a world leader, inspiring others and being imitated everywhere, but now you secretly feel you're close to irrelevant. Many of your former achievements have been taken from you and sullied. You think that maybe, just maybe, there's a reason people might want to go to Watford.
District: You started life quickly learning the harsh reality, being abandoned by friends early on, and yet still managing to get by. You're outdated as well, but willing to admit and embrance that, making the best of what you have and celebrating your achievements. You will abandon something that still has value in order to try to keep up with the crowd. You're very good at making use of and acquiring the resources of others; but you've also given things of your own up for better causes.
Circle: You're forever trapped in the middle of bitter rivalries and arguments, though things recently have finally calmed down a bit. You're thus able to keep your cool. You remained constant and steady for the longest time, attempting to inject some stability into your life, but you have recently finally realised that it's time to move on for your own good, even if it upsets some people. When things go wrong for you, they really go wrong, but you always remind yourself that you'll get there eventually, however slow progress is.
Hammersmith & City: You've attempted to reinvent yourself, breaking away from those who previously defined you, but everyone can see you're still exactly the same underneath. Some people wonder what the point of you even is. Despite your best efforts, people tend to forget about you, lumping you together with your peers. You're never well-informed, and don't really have much at all that you can legitimately call your own.