Assuming Rahu is in the 9th House alone, not in conjunction with another planet.

General characteristic:

• Having an unusual approach toward religion, questioning religion
• Constantly in search of a powerful guru/teacher/coach. Therefore, one is a “Guru-Jumper”
• “A shape shifter” in front of the Guru/teacher/coach.
• Fond of traveling, may live in a foreign land
• Not following the culture/religion where he was born. Have a foreign Guru/Teacher/Coach.
• Tendency to have 2 marriages

1/ If Rahu is benefic (best case scenario)

• Compassionate, grateful, and helpful
• Might get fame and respect
• Have followers
• Might often get injured, but the healing process is fast
• Good for professions in metaphysical, philosophical fields

2/ If Rahu is malefic (worst case scenario)

• The result is not just bad, but the worst in comparison with the placement of Rahu in the other 11 houses.
• The living signification of Jupiter is gone, such as oneself, father, teacher/guide, and the children suffer
• Greedy, anti-religion, miser, and miserable
• Doing questionable deeds and not helpful to others
• His clothes are not washed regularly
• Fear God, fear Enemies
• Get injured often, and the wound can't heal properly
• Falling into delusional thoughts/wishful thinking

3/ When Rahu is in the 9th, the negative effect might be controlled, if

• It’s conjunct with the Moon or Jupiter. Though some minor health issues are unavoidable, it’s still better than being miserable for a whole life.
• There’s the aspect of exalted Mars, or the aspect of Jupiter
• The Sun is in the 5th House
• Mars is in the 3rd or 12th House
• Sun and Mercury in the 3rd House
• Saturn is in an earlier House

4/ Artificial remedies will not work for malefic Rahu

• If one worships because of fear, he's still under the malefic effect of Rahu.
• Without the help of a true Guru, there's no way out of misery. However, the first Guru/Coach/Mentor is often the wrong one.