Eren is frequently accused of being a terrible captain. He sleeps on the job all the time and drinks enough to sink a ship. He is blunt and doesn't tend to spare feelings if he feels something needs to be said.
He's an arrogant, egotistic asshole and his expressions often flick between a scowl and wry grin. He is bad tempered as he is laid back. He claims not to differentiate between the sexes, although he will scorn men who attack women yet openly fight with females without remorse. (condescending ass!) He is a ridiculously strong swordsman and known for his 'terrible crimes'. He is famous for fighting with three swords at the same time.
Dependant on circumstances he can be a bad guy just as easily as he can be a good guy. It's important to remember he's a Pirate, and he likes to remind people of it when he receives judgement or criticism.
Despite being ruggedly handsome, his interest in women is lacking. He doesn't realise that many girls like a villain and scoundrel. If he had a type it would most likely be a woman who doesn't like him or disapproves of him. A girl who is morally correct and can hold her own to an extent. Or maybe he'd like someone who is equally devious. What am I saying? He doesn't even know what he wants, how am I supposed to know?

He has aspirations and is very stubborn when he sets his mind to something. He is searching for something, something that might be a little impossible and even if he did achieve it, would I really want him to? After all, he's no angel...