Gerald Martin Johanssen is the tritagonist of the Nickelodeon animated television series Hey Arnold!
At school, Gerald is the class president, and considers himself very cool, and apparently, so do his friends. When it was revealed that Arnold was on Rhonda's so-called "Cool List", and that Gerald was on her other list known as "The Geek List" (due to a grudge Rhonda had against him over running for class president), many classmates were surprised to find this out. He can even become jealous of others if they steal his spotlight, which likely stems from his home life, where he is the oft picked on middle child.
He often serves as the voice of reason in the group of fourth grade friends, and a realistic counterbalance to Arnold's optimistic attitude. This sometimes causes conflict between the two, but never for long. Another facet of Gerald's personality that opposes Arnold's is his weaker sense of morality. Gerald is far less open to helping others, and almost always attempts to dissuade Arnold from doing so. He's also more likely to spite somebody that he believes has wronged him, such as his brother. He's also somewhat selfish, seen when he hesitated to tell Jamie O that his girlfriend was manipulating him.
Gerald's most distinct features are his hi-top fade (classmate Helga often calls him "Tall Hair Boy"), and his red shirt with the number 33 on it. Now, he wears a red sweatshirt with the same number on it. He also wears blue jeans and red and white sneakers. His outfit remains unchanged during the field trip, but his sweatshirt's sleeves are rolled up and his jeans are torn at the legs.
He serves the role of storyteller in the fourth grade group, and his tales are often the setup of the urban legend episodes. He sometimes delivers the urban legends in the form of jazz poetry, which he also recited on stage at the Coco Hut. Gerald's flair for performance has also manifested musically, such as in the episode "Gerald's Tonsils", Gerald is a soloist of chorus, in "Partners", he plays the piano, and in the episode "Arnold As Cupid" he's briefly seen playing violin.
He notably possesses a lot of information and know-how on Hillwood and its residents, some of which provided by his mysterious friend Fuzzy Slippers. Gerald has expressed some musical ability: in the episode "Gerald's Tonsils", Gerald is a soloist of chorus, in "Partners", he plays the piano, and in the episode "Arnold As Cupid" he's briefly seen playing violin.
He developed a fear of riding a bike after he accidentally rode down the steepest hill in the city, and crashed, when he was small. However, Arnold helped him over come his phobia, and win the city bike race.
- Timberly Johanssen — Gerald's little sister. She is usually causing trouble due to her desire for attention or naturally childish behaviour. Unlike all the other children on the show, Timberly seems to get older throughout the series: At her first appearance, she is mentioned to be four years old, but she already attends the first grade in "Timberly Loves Arnold".
- Jamie O Johanssen — Gerald's older brother, who while he causes trouble for him, ultimately cares for him, their relationship becoming more amicable after the events of "Jamie O in Love ".
- Martin Johanssen — Gerald's sometimes strict father, complains about wasting electricity.
- Mrs. Johanssen — Gerald's very kind mother, keeps family together.
According to one of Craig Bartlett's Hey Arnold! comics, Gerald has a bald uncle named Maurice.
- Arnold Shortman
- Phoebe Heyerdahl - Gerald's classmate, who it was strongly suggested he had a crush on throughout the series, which she likely reciprocates. Main article: Phoebe and Gerald
- Connie — A sixth-grader who was Gerald's "date" at the school dance in "6th Grade Girls", but it turned out that all she wanted was to make her boyfriend Burt jealous. She was the first girl to kiss Gerald.
- Chloe — an older girl who recently moved into the neighborhood, who hung out with Gerald, but only to get closer to his older brother Jamie O. Gerald felt betrayed after the truth was revealed.
- His hair looks similar to Marge Simpson from The Simpsons.
- In later episodes, his voice actor, Jamil Walker Smith's voice was digitally mastered to a higher pitch by using sound audio.
- Hey Arnold! The Jungle Movie is the first and only time Gerald has a new voice actor. He sounds noticeably more youthful as a result.
- Gerald's last name is spelled "Johanson" in the first season and "Johanssen" in the second season, although it's spelled "Johannsen" in the credits for "The High Life" and "Johansson" in the credits of the "Urban Adventures" tape. Since Gerald signs it "Johanssen" in "The High Life", that's the spelling used here.
- It has often been speculated that his shirt featuring the number "33" is a reference to Chicago Bulls player Scottie Pippen, Craig Bartlett claims that this is only a coincidence.
- Gerald seems to have figured out Helga's feelings for Arnold at some point before Hey Arnold! The Jungle Movie.
- "Phoebe and Gerald: Lovers in the Background" published by Shieldmaiden56 on "Hey Arnold! – A Critical Analysis"