Carlsson, 18 (12/26/04), was named the Swedish Junior Hockey Player of the Year, recording the most points and assists by a junior player in the Swedish Hockey League (SHL) with Orebro, recording 10-15=25 points in 44 games as an 18-year-old.

Selected by Anaheim in the first round (second overall) of the 2023 NHL Draft, Carlsson’s 25 points were the fifth-most all-time by a draft-eligible player in the SHL, trailing only Daniel Sedin (42 points in 1998-99), Henrik Sedin (34 points in 1998-99), Elias Lindholm (30 points in 2012-13) and Nicklas Backstrom (26 points in 2005-06). Carlsson led SHL players 20 and under in points per game (.57) and ranked second in goals, and third in points and assists.