Base-Breaking Character: R2-D2 is not a particularly popular character among the small fanbase, but some found him weird and out of place, while others simply didn't care.
Fan Nickname: Before the group was known as J Ja R people jokingly referred to as "Squa".
I Am Not Shazam: When R2 was in the comic people who haven't seen the comic would assume it Star Wars based. Anakin's case of shared names does not help.