All saints can offer protection from harm but why not turn the job over to your guardian angel?
St. Michael the Archangel
There is no patron saint for the protection from aliens.
Unless you are a lamb or a farmer's crop, there is no patron saint of protection. Contact your guardian angel, that's his job.
Demetrius is the patron saint of:against evil spiritsBelgrade, SerbiaCrusadersSalonica, GreeceThessaloniki, Greece
They choose a patron saint so that their parish will come under the protection of that particular saint and to give honor to that saint
He is the patron saint of Trier and invoked as protection against perjury, loss at sea and destructive rains.
I don't believe there's a patron saint for rats, however St. Francis of Assisi is the patron saint of animals.
St. Liam is the patron saint of shepherds and the protection of livestock. He is also known as the patron saint of asthma sufferers.
Saint Agnes is considered the patron saint of young girls and virgins and is often depicted holding a lamb, symbolizing her purity and innocence. This association has led to her also being regarded as a patron saint of lambs.
Saint Sarah is not considered the patron saint of laughter. She is actually honored as the patron saint of the Romani people and is associated with fertility, protection, and good fortune. The concept of a patron saint of laughter is not a traditional designation in Catholicism.
The patron saints for protection against mice are Saint Gertrude of Nivelles and Saint Servatius.
The Saint Michael the Archangel the patron saint of police officers because of the protection role he played for God against the disloyal angel, Lucifer.
Saint Nicholas, also known as Santa Claus, is often considered a patron saint of children. He is known for his acts of kindness, gift-giving, and protection of young ones in need. Parents often invoke his name to help children in difficult situations.