Ketu can be favorable or unfavorable in any house of horoscope and all this depends on certain factors. There is no thumb rule to judge these things. We humans generally commit mistakes while judging planets and their behavior. But the bitter truth is, no planet is 100% favorable or unfavorable.
Nature: Natural malefic
Represents:Liberation, spirituality, separation, all kind of mental issues, stamina, depression, healers, computer languages, secretive activities, athlete, detachment, intuition, special gift of god, demonologist, lack of logic, maternal side, controversies, accidents.
Ketu is gyankaraka. It always aware us about the real truth of life. It generally removes the material qualities of the placed sign, if it is benefic then shows beautiful satisfaction for that house signification.
Ketu is shadow planet and it’s results totally depends on other planets and association with them.
I am discussing both benefic and malefic results of ketu because it must have played his both roles in chart, but intensity and surroundings matters:
Benefic: disciplined, spiritual, social worker, healer, athlete.
Malefic: confused, liar, physically weak, introvert, lack of self confidence.
Benefic: sweet speaker, values occult or researches, support from maternal side, earning through healing, advising or consulting.
Malefic: Problem in speech, problems in family, bad presentation skills, spendthrift, danger from animals.
Benefic: hard working, athlete, creative, good in mathematics, courageous, respected in society.
Malefic: No younger sibling, introvert, dumb, weak, traveling for medical treatments, defect in ears.
Benefic: Spiritual mother, Settled away from native place, adviser, inheritance from mother.
Malefic: Bad environment of home, problems with mother, disputes in property, lack of mental peace, heart attack.
Benefic: Learner of vedic sciences, computer or different languages, blessed with good child, good intuitive mind, mathematician.
Malefic: disobedient or no child, bad education, flopped career, superstitious, gastric problems, ulcers in stomach.
Benefic: Wins in debates, lawyer, doctors, hard working, sportsman, could be in intelligence department.
Malefic: Troubled by enemies or diseases, problems to maternal uncle, lazy.
Benefic: Sanyaasi or a spiritual spouse, could be dealing in sports, books, software business.
Malefic: Separated from spouse or very bad married life, low sexual energy, short tempered, cheated by opposite sex.
Benefic: Good intuitive energy, inheritance from maternal side, adviser in foreign country, involved in occult sciences.
Malefic: Danger from animals, water or electric, poor, losses in speculations.
Benefic: Religious and spiritual, father could be priest or spiritual, traveling of religious places, mastery in computer science
Malefic: Problems to father, trouble in initial part of life, destroyer of own clan
Benefic: Healer, respected in society, astrologer, more successful if away from natal place.
Malefic: Unstable career, father could be harsh speaker, involvement in illegal work.
Benefic: Social worker, satisfied with his/her work, sharp mind, earning through consultation or advisory.
Malefic: Flopped career, obstruction in earning, no younger siblings.
Benefic: Spiritual, enemies destroys easily, teacher, spiritual wife or sanayaasi, get salvation easily
Malefic: Lack of bed pleasure, imprisonment, mad and in asylum, disturbed married life, undiagnosable diseases.