Sugarfi is a programmer who likes to rant about free software and GNU and also hates the JS type system. He's infamous in the Discord server for being very adamant with his opinions, never willing to shift on them in any way.
Roylatgnail says "sugarfi is one of the best repl users" and that "sugarfi is god".
MrEconomical says "sugarfi is the x86 god".
Also they made stuff with the Repl.it API, and wrote some tutorials.
Sugarfi also got banned from the Repl.it Discord after some confusion.