Both The Rival and Kid Flash introduced unique variations on the Speedster costumes that we’ve become accustomed to, with the Kid Flash costume in particular looking just different enough from the Reverse-Flash’s striking, all-yellow suit.
Aside from trying to date an alternate reality Iris West (Candice Patton) though, and enjoying the company of his still-alive parents, Barry was also introduced in the alternate universe to a superpowered version of Wally West (Keiynan Lonsdale) as Kid Flash and Wally’s own archnemesis, The Rival (Todd Lasance).
[WARNING: SPOILERS for The Flash season 3 premiere ahead.]
The possibility of seeing Cassidy’s Black Siren return at some point seems open-ended for the time being as well, with her character still very much being alive in the multiverse.