The guy in the space suit is actually Mono’s dad, his name is Timothy Marsh.

Eyesore is actually a transformed and mutated version of Mono’s mom, who’s name is actually Jennifer Marsh.

Mono has a childhood crush who is now dead due to prostate cancer.

Timothy and Jennifer have been missing for a heavy portion of Mono and his siblings lives because Timothy was lost in the fabric of time due to testing a portal device, not long after that, Jennifer followed after him but was also lost and never returned.

At the end, Timothy dies.