If you mean how many Doctor's - then eight in the old series, and three so far in the new series (though the actor playing the eleventh doctor is due to be announced today). There have been hundreds of separate characters..
I'm not sure about the old series of Doctor Who, but some of the main characters in doctor who in the previous series (2010-2011) are:
the doctor
rose tyler
Martha Jones
Donna nobel
captin jack
Sarah Jane smith
and many more....
No, as of 2012 he has never currently been on Torchwood. However characters from Torchwood (mostly Captain Jack Harkness) have appeared in Doctor Who.
About 10
There are no sites that show you how to draw Doctor Who characters, but if you go on the Doctor Who official website (www.bbc.co.uk/doctorwho) and then onto comic maker, there are drawn images there. Maybe you could copy them?
Depends on how many characters you got and how many columns it got
Doctor John Robinson , Doctor Maureen Robinson , Major Don West , Judy Robinson , Penny Robinson , Will Robinson , Doctor Zachary Smith and The Robot .
Nobody knows! There have been 100s of monsters in Doctor Who
No, as of 2012 he has never currently been on Torchwood. However characters from Torchwood (mostly Captain Jack Harkness) have appeared in Doctor Who.
there has been about 777 episodes of Doctor Who
David has been The Doctor for three series; two, three and four.
There have been 753 episodes in Doctor Who.
796
25
Sylvester McCoy, the Seventh Doctor, and David Tennant, the Tenth Doctor, are the only Scottish actors to have "officially" played the Doctor, though many companions and side-characters have been Scottish. UPDATE: As of 2014, Peter Capaldi has taken on the role of the Twelfth Doctor becoming the third Scottish actor to "officially" play the Doctor.
About 10
He has been Barty Crouch Jr in Harry Potter and the Goblet of Fire, the Tenth Doctor in Doctor Who and plenty of Shakespeare's characters on stage, most famously Hamlet in Hamlet.
The Doctor has had 29 different companions since the program's launch in 1963. There are also many other characters who may or may not be classed as 'full-time' companions.
Too many! Lost count! :')