Gwen Cooper: A 19 year old girl with the powers of invisibility, telekinesis/telepathic and is a Time Lady. No one knows that she is related to the Doctor except for Rose Tyler and her friends. She and Rose Tyler are like twin sisters but they aren't related.
Rose Tyler: Another 19 year old girl. She has the power to control time and space. She can also bring people or animals back to life. She can wipe people or things out of existence. She and Gwen are like twin sisters.
Toshiko Sako: Another 19 year old girl. She has the powers of speed and force fields. She is a genius and loves to make things. She is best friends with Rose, Gwen and the others.
Owen Harper: A 19 year old male. He has super strength and super vision. He is a flirter. He has a crush on Toshiko and hides it. He is a part time Doctor and takes care of his friends injuries.
Ianto Jones: Another 19 year old male. He has the power to shape shift and can use anyone's power if he's in that form. He makes awesome coffee and loves to clean up after the others.
Torchwood. It doesn't just chase aliens, it trains future heroes.
Led by Captain Jack Harkness and helping hands of the Doctor and Dr. Martha Jones.
Now a new team is made.
Captain Jack Harkness: Jack first met the Doctor with Rose but unfortunately an accident had them separated and he became immortal. He started training heroes when he joined Torchwood and was a member of a team. His team died when one of them turned on them. He's the only one left and now he has to train the new team for two years.
The Doctor: The last Time Lord, or so he thinks. He thinks his sister died in a fire many years ago but doesn't know that Jack saved her life. He did have the TARDIS up and running until the accident that separated the three of them. Since then he's been working on it and working under Jack until then.
Dr. Martha Jones: She has a crush on the Doctor but saw that he had fallen in love with someone else. She hates the new team but doesn't show it. She is being controlled by the Master but doesn't know it.