The person looking for Pat in the very last scene is Sylvester Pemberton, aka Starman, a member of the original Justice Society of America and the man who Courtney Whitmore, aka Stargirl, once thought was her biological father.
Starman, as viewers will recall, died in the series’ first episode, so a big question we need answered in Season 2 is how the crime fighter is alive. Screen Rant had an interesting theory based on the drama’s original source material.
“The most likely explanation may be that this Starman is a time-traveler and that Sylvester Pemberton was sent forward in time during an earlier adventure before his death; something which happened to all the Seven Soldiers of Victory at one point in the Stars & STRIPE comics,” author Matt Morrison noted.
But the return of Starman wasn’t the only plot twist to come out of the finale. The Injustice Society was defeated after taking control of several JSA members in the penultimate episode. Doctor Mid-Nite was able to free Shining Knight and STRIPE from ISA’s lair remotely while Stargirl destroyed the satellite dishes broadcasting the group’s signal.
The only supervillain confirmed to have escaped the attack on their base is Cindy “Shiv” Burman, who recovers a glowing black diamond among The Wizard’s old belongings. While staring intently at it, she says, “I see you in there… Eclipso,” referring to another known villain in the DC Universe. Will they team up with The Shade next season?
Source : https://www.distractify.com/p/stargirl-ending-explained