Hap is the second-in-command of Gekkostate, although it can be debatable at times when Talho is around. Hap handles Gekkostate's finances, and manages information (not to be confused with Gidget's position of communications). While on the bridge in action, Hap's job is to monitor trapar levels, though he is also there frequently at night trying to obtain intel on matters crucial to the Gekkostate. He is also one of Holland's childhood friends (since they were 3 years old, he asserts), and played a key role in convincing Holland and his SOF team to desert. He gained his nickname from his ever-present "happy smile". Hap is very parsimonious when it comes to spending money and is also notably unathletic, especially when it comes to playing soccer.
Hap is the only member of the crew who voices his disapproval of Holland's treatment towards Renton and attempts to defend the boy before Holland overpowers his efforts. Despite this, he does little to nothing to actually help Renton with his troubles due to it being Holland's responsibility to correct the problems he created among the crew. He is sometimes afraid of Talho, who tends to berate most of the crew on the Gekko, and develops a high opinion of Renton after he returns to the Gekkostate; when Renton said he still planned to leave once he made up with Eureka and Holland, Hap told him to stop talking like that and he would cheer for Renton on whatever he chose to do because he is an important member.
- In Eureka Seven: The Day After, Hap resigned from the Gekkostate on April 13, 12006, and left with Stoner to presumably travel the world.
- In the final chapter of the manga, he is last seen working for a fish shipping boat.
- In the film and novel series, he turns into a minor antagonist. In the film, he and Stoner attack Eureka under the assumption she is a fake maiden and he shoots Renton in the abdomen before being killed by the Larvae Nirvash. In the novel series, he betrays the crew by attempting to turn them over to the military for his own benefit.