Ike: How do you salvage bad, bad, and worse?

I'd say -atk hurts him the most, so keep the second one.

Guess we're on the same boat. I have two Ikes who are +Def -Atk and +Res -Spd. The +Def Ike has less Attack, but he can still hit like a truck with an slightly more tanky spice. My ideas would be:
•Merging all Ikes with a +Def Ike (Or just merge him with only one). You would get a stat increasing in Defense and HP, the Second one being Attack and Speed (I assume) and with the Squad Ace B 1 seal and Fury, he is a better Xander with 51/34/40/21 (52/35/40/21 with +2)

• If you only merge him with one or with none, Heavy Blade and Aether are great skills which really compliment each other, as you may or may not know. So when you have a fav unit who has high Attack (I would say over 50), feel free to give him an upgrade.

And if nothing suits your fancy, you can send every Ike home and get 3k feathers. Yaay

Ouch, that's pretty nasty. Not the end of the world, though.

The only trouble with -Atk Ike is you'll have to pass on his amazing Heavy Blade / Aether combo and opt for something else. Besides that, having 48 attack with -Atk isn't as bad as it sounds. I've got +HP -Atk on both Lucina & Ephraim and trust me, they work perfectly fine.

+Res -Spd Ike's 28 speed definitely stings, but he makes up for it by surviving mages better. I have two of him in my secondary account (yes, 2 with the same awkward IV, lol)... If I can't summon a better IV, I plan on trying him with Heavy Blade / Quick Riposte / Aether.

If you're going to build one, build the +res/-spd one. I have a -atk/+spd Ike and he is not usable other than as third or fourth option sword slot in chain challeges / tempest trials.

As for what to do with the others, merging (1) and (3) into (2) would give you a pretty potent Ike with good arena weighting.

You can always save the other two for fodder if you happen to get some monster attack units who could benefit from heavy blade. The heavy blade / aether combo is hard to replicate except perhaps on a +atk Chrom.

Well, I mean, you've got three Ikes. Three fuckin Ikes. Talk about "unlucky"? You're nowhere as bad as you think you are. For one, you can merge them to even further improve their stats. Another thing is, you can put Fury on him so he gets a general boost all-around (also helps him not get doubled as much).

I'd likely keep the -Spd one, since he can still be very scary with neutral Atk and with something like Vantage or Quick Riposte. You also have +1 Seals to further improve either Atk or Spd (I might go for Spd).

My Ike is -atk, and he's still destroying absolutely everything. Give Ike Quick Riposte, Heavy Blade and Aether, and watch him laugh at that attack bane. Besides, you do have three of him. If you choose to merge them (which you really should) that will go a long way towards canceling out whichever bane you end up going with. Honestly, I would go with your +DEF/-ATK Ike over the other nature, since -SPD is more punishing IMO. Ike's naturally high attack really won't be hut by the bane as much as you'd think, and giving him QR will make him a distant counter monster.