Adrien loves both sides of Marinette; however her cheeky, daring, just and competitive side he loves most. But still, her shyer and tender side (secret identity) is still just as important to him. Same for Marinette, she cares most about Adrien's calmer, level headed side, but his flirtatious and bold side means alot to her too. They love everything about the other; it's not a love square. They just don't know it yet.