Bisca Mulan is originally from the west, she came to the Fairy Tail Guild as an immigrant and joined up. She was first introduced in chapter 2 and episode 9. Bisca is very polite and nice to her guild mates. Bisca has great admiration for Erza Scarlet since they have similar magic. She also has a huge crush on Alzack Connell but she can't bring herself to confess.
Bisca's ability is similar to Erza except she can re-equip many different guns and use them.
(Source: Fairy Tail Wikia)