The whole EDI and Joker thing is CREEPY.
Actor Seth Green on Being the Joker Of "Mass Effect" - MTV
Both of them are vital supporting characters, but in terms of personality, heroic acts and abilities throughout the series, who stands out: EDI, or Liara? Many of Commander Shepard's beloved squadmates underwent personal growth and remade themselves for the better, such as Tali'zorah and Grunt the Krogan warrior. But no one transformed more than Liara T'Soni, who began the story as a meek and unassuming archeologist. She could barely even hold a conversation with a stranger. But all that changed when Liara met Commander Shepard, and not long after the Commander's death, Liara became a bold decisive hero who took matters into her own hands and rescued Shepard from the Collectors and Shadow Broker. Later still, she actually replaced the Broker herself.
Joker is an excellent pilot and confident to the point of arrogance, wasting no time in pointing out his prowess to others. He's quick to ensure everyone knows his many accomplishments and commendations were all earned, and not due to charity for his medical problems. Born in , Joker's upbringing and career have been colored by his health. Joker has a moderate to severe case of Vrolik syndrome , which causes extreme brittleness in the bones; he was born with severe fractures to his legs and even with modern medicine he finds walking nearly impossible, relying on crutches and leg braces. Joker spent his early life on Arcturus Station because of his mother's job there as a civilian contractor, and grew up around ships.