The first fighting Game I really played seriously was Samurai Showdown.
I kept playing it throughout the years and as the new ones came out I played those all the way up to 4
Heck I even played the obscure Samurai Showdown 64, and own the even more obscure Samurai Showdown: Warrior's Rage.
I didn't get into Street Fighter until 3rd Strike
I spent a significant amount of time playing Last Blade 2. (10 hit combos with Setsuna were always fun)