Who do you think it is? This is a list of almost every suggestion I've seen given for the Knight's identity, regardless if it was a joke or not. : r/Deltarune
Chaos Knights Combos 1 - Rampager Mortal Wound Bomb — Line of Sight
Floaty Boaty Knight | Don't Starve Wiki | Fandom
Meta Knight - WiKirby: it's a wiki, about Kirby!
Shovel Knight Showdown | Shovel Knight Wiki | Fandom