Jabe

Jabe was a representative of the Forest of Cheem who had come to see the destruction of Earth in 5,000,000,000. Upon meeting the Doctor, she took an immediate interest in him, and, after discovering his true heritage, felt grief at the loss of an entire species, with him as the only survivor.

When Platform One came under attack, she sacrificed her life valiantly, staying behind to allow the Doctor to fix the sun filters. She burnt to death under the immense heat. (DW: The End of the World)

Charming and flirtatious lead representative from the Forest of Cheem, who visited Platform One to witness Earthdeath. Her ancestors were from a tropical rainforest on Earth. She could project a liana from her wrists. She presented the Doctor with a sapling of her grandfather and later, after learning his true heritage, devoted herself to helping him save the space station.(REF: Doctor Who: The Encyclopedia)

When Davros made the comment "Everywhere you go someone always dies" to the Doctor, Jabe appears in a flashback of beings who have died doing the Doctor's work. (DW: Journey's End)

She was notably the first character to die for him in the new series.