Before あなた go flaming on me, I should remind あなた that this is my opinion and since this is the Amuto vs. Tadamu club I should say that this is the most appropriate place to write it down.

1) Ikuto is protective of Amu. Although Tadase is also, I would say that Ikuto is によって far もっと見る protective of Amu than Tadase is (my opinion). Ikuto likes to flirt and tease Amu, much for us ファン to describe him as "naughty". Amu becomes embarrassed and gets all defensive around Ikuto. But what she doesn't know is that Ikuto does this to cover his strong feelings for her and to protect her from being hurt/killed...