Fanon

Fanon:
 * Several fans tend to write Danger Mouse as secretly having PTSD. This tends to cross over with a backstory about why he wears an eyepatch.
 * Danger Mouse's parents possibly being dead.
 * Also, a few have given Danger Mouse's real name as "Danny". His real name has never been revealed in the actual series, though it seems most likely that "Danger Mouse" is his real name.
 * Professor Squawkencluck being embarassed at her oversized bottom. It's been mentioned in a couple of fanfics (one of which it's the main focus), but in the series proper it's almost never commented on.
 * Also, Squawkencluck being a fan of Japanese cuteness.
 * Many like to view Danger Moth as being a lesbian.
 * Dawn Crumhorn can switch from a child to a teenager and possibly a fully grown adult, but prefers to remain a child
 * Professor Squawkencluck and Danger Mouse's wedding glimpsed in the official series finale was not an actual ceremony and may have simply been part of an undercover mission both had been assigned to.
 * Danger Mouse and Dawn Crumhorn are ultimately endgame