Jack

In Final Fantasy VIII, there isn't a character directly named "Jack." However, based on your query, there are a few related figures and concepts to explore. First, "Jack" might refer to Jack Garland, the main character of Stranger of Paradise Final Fantasy Origin, who is connected to Garland, the antagonist from the original Final Fantasy. However, this character is unrelated to Final Fantasy VIII. Second, in Final Fantasy VIII, one of the protagonists, Squall Leonhart, uses a weapon called the "Gunblade." While the Japanese name "Gunblade (ガンブレード)" has some phonetic similarity to a name like “Jack,” and the “blade” portion might correlate with the keyword “Jack,” this is not his actual name or nickname. Also, the game features Guardian Forces (GF), which are summons. However, “GF” does not refer to any person. Therefore, if your query refers to "Jack" within Final Fantasy VIII, there might be a misunderstanding, or you might be referring to other "Jack"-related characters or information outside of Final Fantasy VIII.