In Letter II of Mary Shelley's Frankenstein, Walton admits to his sister, Caroline, that she may find him a romantic.
You may deem me romantic, my dear sister.
Prior to this, Walton has described his passion for seeking out the seat of magnetism (at the North Pole). Walton has stated time and again that nothing will keep him from obtaining his goal. Letter II offers a very different view of the researcher.
The opening of Letter II details the isolation Walton is feeling. Not only is his ship surrounded by ice, he feels alone aboard a ship filled with men.
I have no one near me, gentle yet courageous, possessed of a cultivated as well as of a capacious mind, whose tastes are like my own, to approve or amend my plans.
Unfortunately for Walton, the men on the ship are far from these he would consider a mirror of himself.
Lonely, Walton admits to Caroline that he desires a friend.
I greatly need a friend who would have sense enough not to despise me as romantic, and affection enough for me to endeavour to regulate my mind.
Again, Walton mentions the fact that he is a romantic.
A romantic is a person who idealized their dreams and desires. Drawn by nature, the romantic looked to the natural world for inspiration. Romantics also highly valued their emotions (poignantly seen with Walton's concern that people may despise him given his romantic nature). Essentially, a romantic is not the stereotypical character infatuated with love. Instead, a romantic is emotional, drawn in by the natural surroundings, and a slave to their dreams.