Question

hi has more covalent character than hcl

Answer 1

The difference in electronegativity of $Cl^-$ ion and $H^+$ ion is more than the differnce in electronegativity of $I^-$ ion and $H^+$ ion. More the electronegativity differnce, more will be the ionic character and less will be the covalent character.
So HI is more covalent than HCl.

Answer 2

HI has more covalent character than HCl.This is because Iodine is less electronegative as compared to Chlorine which leads to the difference of the electronegativity of H+ and l- to be less than the difference of the electronegativity of H+ and Cl- . Since, higher the difference between electronegativity of the compound composing atoms , lower is the covalent character and vice versa.

Hope i helped u:)