Saki Nijino

Saki is a big fan of baseball and soccer, and even serves as the manager of the soccer team at Kirameki High (later installments from the franchise seem to skew her interests exclusively toward soccer). Her motto is "Have guts!". She's more of a cheerleader than a sports player, though, and is often seen raising morale for the team she coaches. Thus, her type of boys are those who are strong-willed, and perserverant in everything they're doing.
(Source: Tokimeki Memorial Wiki)