In the beginning of the Octo Expansion Arc, Eight claims to have lost his memory, aside for snippets of his memory which showcased him with his teammate, Seven. He is friendly towards Goggles when they first meet, and even protects him which he is in danger. He is portrayed to be similar to Goggles as he tends to support his antics or do them as well, first shown in Chapter 24 of Volume 7 where he helps Goggles lay the Octarians to rest and treat them for their 'cold'.
Trivia
According to the Inkling Almanac, Eight has started to pickle things thanks to Goggles' and Cap'n Cuttlefish's advice.
He has decided to keep the name that Goggles gave him, even though he has his memories back, because he has grown fond of it.