(Guys, these are personal opinions.)
Z1GMA: 42 - 58
Comment: His jabs. Those... Jabs...
Every Ganon who has met a good Ike knows how much he/she depend on Jabs.
His Jab Cancel can do pretty nasty things to Ganon.
Let's say we swapped Jabs with Ike. We got his Jab - He got our Jab.
We'd get a Ganon 70 - 30 Ike, no doubt.
Anyway... Get him off the stage - He'll die.
Perferably with Ftilt.
Also, Ganon exel at Dtilt-distance in this MU.
It outranges Ike's Jabs, and it is faster than all of Ike's Long
SMASHKNG: 35 - 65
AVOID JAB AT ALL COSTS! Ganon is one of the easiest characters to jab cancel in the game normal jab canceling gives a total damage of 20% per jab but more if he locks which is possible on Ganon and his poor OoS doesn't help at all, it even ***** spot dodges. If you get hit by it, get an amazing SDI. Space Dtilts outside his jab range (don't know if he can shield grab it or not though). Don't get grabbed either at anything at mid percents from like 40 to 100%, the DA is completely unavoidable (or at higher percents TECH the Bthrow) and will put Ganon at a dangerously low angle, Ike does not have any trouble gimping Ganon like all other characters, while Ike is very risky to gimp for Ganon at most positions he falls offstage because of his Up b and if Ganon gets hit by it he doesn't have much chance of surviving, you must be careful offstage against Ike. He also has a Fthrow or Bthrow to Fthrow chain grab in walls and at high percents when you fall in the edge it's for Ganon to either choose to get hit by it or use his laggy air dodge and fall in a bad position. I think DA OoS can hit Ike from a well spaced Fair, but from Nair only powershielded. The Fair outranges Ganon in almost any way and can gimp well offstage with its range so he doesn't have to get any far offstage. Beware also retreating SH Bairs in the ground. While Ike is not so easy to tech chase because of his amazing rolls, having Gerudo Ftilt helps a lot in this MU, especially if you land it near the edge.
the king of murder: 30-70
Jab is not the only thing that wrecks Ganon though it's one of the reasons why it's a bad MU for us. Ike can Jab Cancel in so many things and Ganon is espacially vulnerable to Jab Cancel because he has no aerial fast enough to interrupt it. He can Jab Cancel to Jab 1 again, U-tilt, B-air, grab ect... (I once Jab Canceled a Ganon to Jab 1 over and over again). Jab also eats Spot Dodges. Ike's N-air can lead into either a Jab, B-air, U-tilt or U-air all at low -mid percent, can be autocanceled and is good for frame trapping. Ganon has nothing that outranges Ike's F-air so if he spaces it well, you can't punish him. You never want Ike to be beneath you because U-air, U-tilt and U-smash **** your Air Dodges if timed right. F-throw is a CG on stages with big walls. B-throw-->buffered DA is guaranteed at 12%-95%. D-throw can lead into N-air or U-air at very low percent. Ike is not easy to gimp if Aether is spaced correctly and you will risk getting Aether spiked if you go off-stage with him. Ike, however, has decent edgeguard tools against Ganon like F-air, U-smash and walk-off D-air.
Try getting Ike above you and molest him with U-air or N-air. Avoid his U-smash and you can punish with Gerudo or a grab. Force Ike to use Quick Draw as a Recovery and you can take care of it with N-ar or U-air.
A2ZOMG: 5/5
This matchup is so stupidly good for Ganon, it really upsets me when I look back at the times I know that simply playing smarter or knowing a simple trick would have won me this matchup. Ike's Jab is kinda annoying, but really isn't that much of a worry as long as you have good SDI. Also shieldgrabbing Ike's Jab REALLY helps in this matchup (time it right, you can basically grab his arm and grab him from twice your normal grab range), and throw followups are GREAT in this matchup.
Flame Choke is also stupidly good in this matchup. It's fairly easy to land because Ike sucks at landing and is slow, and you get like EVERYTHING out of choke on him that matters. D-tilt, F-tilt, and Dash attack. At low percents when you Flame Choke Ike, he should easily take like 40 damage from Flame Choke D-tilt resets or juggles as long as you make a good read. Then at moderate percents, get him offstage with F-tilt, edgeguard him with ledge invincibility abuse reverse U-air and he dies. Or alternatively you can U-tilt his Up-B if he's trying to sweetspot, or you can let Flame Choke Dash Attack kill him. Either way as long as your choke game is good and as long as you realize Ike's up-B is worse than yours and that you can punish his recovery HARD, you should at least have the advantage in scoring kills.
This matchup is just really really stupidly good for Ganon. You just need to be patient, DI well (don't be an idiot and DI away from B-throw -> DA), and know your choke followups and how to properly edgeguard. This matchup is very very winnable for Ganon.
Vermanubis: 35:65
Comment: Ike's jab game messes us up harder than anything. He will win every OoS/close range confrontation unless you have godly SDI, in which case, you still run the risk of being predicted. Ike can gimp Ganon fairly easily, Ganon can't gimp him at all without taking huge risks, etc. Ganon does have Gerudo, but that can only take him so far. Ike is just very tough to approach and just has way nastier things on us than we have on him.