Sorry i didn't post anything i wanted to make sure about the MU since the update, lucky me a friend of mine mains both Marth and Ike, sadly he is too defensive and scared to battle off-stage where he could beat me easily, but enough complaining about my friend, i'll get to the point.
[MU]
Ike has tremendously long range with his sword, if i'm not wrong he has longer reach than Marth (correct me if i'm wrong). The last patches made Ike an opponent which you must not underestimate. Even with Roy's speed getting in can be difficult, Ike's jab can take you out of range if he connect all the hits, and if not careful he can trick you and go for the grab after the second hit, it has worked for me that when blocking Ike's jabs, just after the second hit you can get out with a jab and pressure on depending on %.
Also Ike's N-air and F-air comes out really fast and out ranges Roy's aerial attacks, Ike's B-air is a great killing tool which can hit Roy easily cause most Roy players including myself tend to short hop a lot thanks to his aerial mobility, off-stage can be really dangerous for Roy too with Ike's F-air, but honestly i have seen way too little Ike's trying to do this, and most of the time they suicide cause of Ike's recovery, or it's horizontal or vertical recovery.
He is predictable in that aspect, though because of quickdraw is hard to gimp him, Roy can take adventage of his counter not so recommended most likely the attack will whiff, Ike's Aether hist you before he grabs the ledge, but well timed it can be trumped, still i don't recommend trying to B-air after a trump most likely he is going to F-air and you will only get damage and lose stage control, what you want is for him to regrab the ledge and use Flare Blade or read him. Roy's flare blade is a great tool specially for it's low endlag can bait some of Ike's attacks.Ike's smash attacks are slow if you counter them at mid percents, he will most likely die, his strength and knockback will erupt (ba dum tss) in his face if countered. Don't get predictable with those counter or a smart Ike player will charge a little bit more his smash attack and you will get rekt!!.
Roy's trap game and speed is more critical in this MU he can't take a defensive role or Ike will get momentum, YOU DON'T WANT IKE TO HAVE ANY MOMENTUM!!! it will destroy you. Both character weights can be comboed easily, but Roy has an easier time doing so, both have predictable recoveries, but Ike's recovery is harder to stop, you must kill him in one go or take him deep which is a hard spot for Roy due to lack of vertical recovery.
In my opinion this is a really even matchup, but still it's easier for Roy to maintain momentum, more likely to make Ike players make a mistake if they get to desperate just like @
A_Phoenix_Down
said it's Speed vs Tank and a fun matchup. But i think Roy's speed has the upperhand here.
vs
+1, Roy favor for now (Ike is getting hella good with those patches)