Colonel Iris is definately the Mega Man Fandom's answer to Nazo the Hedgehog now.
Source: BLACK_ROSE888.
Known oddities:
SMRPG: Fans accepted one-shot characters, they continue to beg for more appearances (aside that little nod to SMRPG in SS) of Geno and Mallow, although Squeenix still holds the rights to the non-mario characters and entire scenario of SMRPG.
Sonic X: A mysterious hedgehog appears in the end of a teaser, only to be forgotten; they pulled a Lucasfilm here (I.E. scrapping the character/super form in the third or fourth re-write of the script). Accepted as a character throughout the fandom.
Mega Man X4: Colonel and Iris, merged. It started out as a simple little fun drawing until this form wound up in the "Nazo Unleashed" category, and thrown into the Mega Man Zero storyline. Like Nazo, she's been accepted as a "
Vezon/
Vezok type character" since her little "accidental" debut.