Little more is known about him except for a description and 2 gif also provided by the same source.
"The Voice… has chosen me."
An eternal protector, waiting amidst tangled roots at the base of the Citadel. He guards a secret long forgotten and will attack any who stray too close. Imbued with stamina and strength beyond a normal bug, he strikes up close or from a distance with blinding speed. With unwavering devotion, this ancient guardian will fight until the very end, and beyond. Many of the Citadel’s caste have fallen to this deadly warrior. Those who encounter him should turn back, or else prepare for a vicious battle.
The character of Seth was developed together with Seth Goldman, who's a really cool young guy we were fortunate enough to meet and get to know. Thanks to the Marty Lyons Foundation for hooking us up with Seth. Huge thanks to Seth himself! And look forward to entering battle with his deadly bug warrior!
Seth was first revealed by his creator Seth Goldman in a Reddit post mentioning his meeting with Team Cherry as well as his struggle with Ewing Sarcoma, a type of cancer.
The riddles solved to reveal Seth required two passwords, the first one to open the initial file, the second to open the file within. The passwords were protector and bloom. The riddles and solutions are outlined below: