well lets start with their mobility options. zero suits faster than ike, has a better WD, quicker jumps, and a down b with good aerial mobility options. ZSS also has a great dash dance for baiting. Ike has his side b which helps a lot, but it looks like ZSS is a little faster over all. i would say this match will be played like a sheik vs marth match, but slower paced, with zero suit shutting down approaches with paralyzer, and trying to bait and punish ike. with a ranged fsmash, ranged side b, and pivot grab, she is going to play very defensively and wait for ike to make the first move.
A smart ike player would stay on her with constant spacing. if hes plays too defesively, she is going to be able to make an approach off her paralyzer. if he play too offensively and doesnt space properly, he will be punished with nair OOS and get comboed. ike out prioritizes ZSS so if he can use range and pressure to his advantage, then its left to look at how Zero suit copes with that pressure. Her down b can offer quick shifts in momentum, and as stated earlier, her WD and DD are long and quick, so im gonna say shell be able to avoid pressure pretty well and mess up ikes spacing. she can bait out a jump too and get under him, which is exactly where any ZSS player wants to be.
Im gonna say his MU is favored towards zero suit. just play it defensively. she has the range and the baiting options, and she edge guards him hard, which is really the only way for ZSS to get kills outside of fsmash, which is a plus. he can kill her fairly early, but if she can screw up his spacing game with her quick speed, and shut down his side b approaches with paralyzer, than i think its gonna be really tough for ike to land a goot hit on her.