David Gustafsson earned a reputation as Article in HockeynewsRead the sourceArticle in HockeynewsRead the sourceArticle in HockeybladetRead the source while still a junior. Article in Tingsryds AIFRead the source grew up in Tingsryd and began playing hockey there, as he recalled in an August 2020 interview with Tingsryds AIF. His father Erland also played professional hockey in Sweden for 15 seasons, according to Manitoba’s player biography from May Article in Manitoba MooseRead the source. In the Tingsryd interview, David said he had moved to Jönköping at around 15–16 and started A Swedish hockeygymnasium combines upper-secondary (high school) studies with scheduled ice hockey training.Article in Tingsryds AIFRead the source, combining upper secondary studies with a hockey focus.
In autumn 2020, Gustafsson returned to Article in Tingsryds AIFRead the source on a short-term loan to play for the senior team. Article in Tingsryds AIFRead the source.
Article in Tingsryds AIFRead the source. Article in Tingsryds AIFRead the source. Article in Tingsryds AIFRead the source described him at the time as a two-way centre with hockey sense who could be used in all game situations.