Bismark is the twin brother of Sierra, who are complete the opposite of her. He is very shy, and finds it hard to talk to people unless it's about the general store that he owns with his sister. Bismark is self-conscious about this, and through his heart events will show that he's not happy with the person that he is. Bismark wishes that he were more masculine, and wants to socialize better with people so that he can run a more successful business.
Bismark is very determined to run his store, but constantly has to chase after his less business-oriented sister who frequently runs off to have fun instead of watching the store. He often becomes frustrated with Sierra when she doesn't act responsibly and abandons her duties. He's a very responsible person, and worries quite a bit in general.