Yes, Ging's character design and characteristics resemble another of Togashi's characters. You're probably familiar with the series named Yu Yu Hakusho. Ging bares a strong resemblance to its protagonist, Yusuke Urameshi. This isn't the first time that Togashi, the mangaka of Hunter x Hunter, has taken inspiration from his previous designs. When viewing Hunter x Hunter and Yu Yu Hakusho simultaneously, one can clearly notice the inspirations taken by Togashi in his newer series from the previous one.