Hey folks - Just wanted to clarify what's going on here.
The Jess and Kyle arcade cabinet quests used to give you heroes in Battle Breakers. They now give you Razor and Kurohomura in STW instead. If you haven't finished these quests yet then when you complete them you'll get the hero as a reward.
If you've already completed the Jess and Kyle arcade cabinet quests and you do not already have the matching hero (Razor or Kuro) then you'll get them in a giftbox when you log in. You won't get a second copy if you already have the hero, but can recruit additional copies from the Collection Book.