Final answer:
Henry Clerval is the person who unexpectedly arrives in Ingolstadt to study, providing essential companionship and support to Victor Frankenstein in Mary Shelley's novel.
Step-by-step explanation:
The question 'Who unexpectedly came to Ingolstadt to study? How did this help Victor?' appears to reference the characters and events in Mary Shelley's novel Frankenstein.
In Mary Shelley's Frankenstein, it is Henry Clerval who unexpectedly comes to Ingolstadt to study. Clerval's arrival proves to be a significant turning point for Victor Frankenstein, offering him much-needed companionship and emotional support during a time when Victor is deeply engrossed in his scientific pursuits and becomes increasingly isolated.
Henry Clerval serves as a counterbalance to Victor's obsessive tendencies, reminding him of the joy of human connections and the beauty of the humanities, contrasting Victor's fixation on the natural sciences. This helps to rekindle Victor's spirits and momentarily lightens the burden of his secret toil on his creature.