Complex sentence: Most of the secret characters are palette swaps of other fighters with different moveset properties, such as Shadow Lady, a modified version of Chun-Li; the sole exception is Roll from the "Mega Man" series.
Split into simpler sentences: Most of the secret characters are palette swaps of other fighters with different moveset properties, such as Shadow Lady, a modified version of Chun-Li. The sole exception is Roll from the "Mega Man" series.