Roll Caskett is a character from the MegaMan Legends games.
Roll is the granddaughter of Barrell Caskett and childhood bestfriend of MegaMan; she also serves as his "Spotter" on his missions and helps craft new items for him.
Ten years before the events of Legends 2, her parents Banner and Matilda mysteriously disappeared during their attempted venture into Forbidden Island. It was then that her grandfather began raising the then four year old Roll. Now 14, Roll is a brilliant mechanical genius who builds and maintains everything mechanical for the Caskett family, from the Flutter to MegaMan's weapons.
While the original version of Roll offered little more than just being a support role to her brother Mega Man during his adventures against Dr. Wily, Roll Caskett is considerably more involved in MegaMan Trigger's adventures. Roll is responsible not only for building and upgrading Mega Man's weapons and other equipment, but also serves as a Spotter (or guide) for Mega Man.
Roll is sweet-natured, and quite energetic when it comes to her engineering abilities; but she is constantly plagued with worry about MegaMan, whose duties as a Digger tend to put him in considerable danger. Though she certainly knows better than to try to come along with him, Roll devotes herself to doing whatever she can to help. She is extremely protective and in love with MegaMan.
If some circumstances are met, near the end of MegaMan Legends 2 (after the first trip to Elysium) if the player returns to Terra and checks Roll's diary, there should be an entry labeled as "Secret!". In it, Roll confesses that she is in love with MegaMan.