|This build focuses around utilizing Heavy Blade 3. The skill itself is fairly gimmicky compared to more consistent A passive skills due to its activation condition of needing the user's attack to be ≥ 1 over the enemy's attack, but it still can be used to create some fun, sometimes budget (due to it being his default A passive skill) builds.
To start, due to Heavy Blade's Atk activation condition, this build maximizes his Atk by taking +Atk boon and also by using his default 16 Mt legendary weapon Ragnell. Add on a Attack +3 seal for an additional small boost.
Next, we move onto his B passive. Here, we choose Quick Riposte 3 to allow him to get at least 2 hits on the enemy, inclusive of enemies that he cannot double. This allows Ike to potentially KO most foes he goes up against while also gaining more potential Heavy Blade procs. Similar to the Fury set, Swordbreaker 3 can be used as a tech option to check reds while Vantage 3 allows Ike to counter the enemy first, possibly netting some clutch wins/special procs which could potentially save Ike. Generally though, Quick Riposte is the more versatile option out of the three.
For his special, Ike has a variety of choices here depending on what kind of Heavy Blade build a player aims for. For healing and damage, Ike's default Aether can be used. Other lower damage cooldown skills can also be considered if desired.
Healing specials should typically not be considered due to their less reliable nature. Although having a heal special for sustain sounds good, one major problem with heal specials is that they do not account for overkill. So if you proc the special against a low HP unit, you essentially heal only minute amounts of HP and wasting your special proc.
For more utility, Galeforce is also a possible expensive consideration to allow Ike to quickly charge up Galeforce and move again without the assistance of a dancer.
A positioning assist skill such as Reposition or Swap is best used for team support. Similarly, his C passive can either be used for team support or alternatively, Threaten Atk 3 can be used to allow him to proc Heavy Blade against enemies he otherwise wouldn't.
To further bring up his Atk stat, his teammates should run attack buffs such as Hone Atk 3. Delthea gets a special mention due to her Dark Aura giving +6 attack to melee units such as Ike.
To reiterate though, Heavy Blade builds are mostly fun gimmicks due to the reliance on having more Attack than the enemy in order to proc Heavy Blade. In content such as Arena where Advanced battles match you against stronger enemies with higher merges (and most likely stat-boosting A skills) as well as modes such as Tempest Trials with steroid-buffed enemies, Heavy Blade becomes less reliable.