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One Handed Sword
Spacing: 5
Punish Game: 3
Offstage: 3
Defense: 4
You were decent, but some more understanding of the MU will greatly improve your performance. This Ness almost never did an aerial while using his second jump for a recovery, which makes him F-air fodder. (More experienced Ness players will mix up their second jump with a fast attack that has a large hitbox to try and force you to back off.) Also, if you plan on challenging Ness when he's charging for a PK Thunder dash (Probably not what it's called, but that's what it always looked like to me.) you'll want to use fast attacks that interrupt his animation like a Dash Attack or grab. There were a few opportunities to do so that you missed going for a harder read that didn't really work. (Like trying to use an aerial, which would possibly work if Ness is airborne and you pull off a Reverse B-Air at a close range but with their lag is very risky if your timing is off).
You gave Ness a lot of opportunities to recover offstage, and played it safe. If you know Ness has to use his Pk thunder dash for a recovery, then you can easily knock him out of it with a F-air, B-air, D-air for some disrespect or if you want to play it safer use Counter in his required flight path. (Blocking or Countering a PK thunder dash is probably the safest way to handle the attack if you aren't within a dashing distance away from Ness. This doesn't apply to Lucas, for those playing the home game.) Ike's offstage game isn't as terrible as it appears, as in all actuality it's average for the cast. Don't be afraid to go offstage and take the fight to them. Ness is more of a technical fighter than an aerial one like MK or Jiggs, meaning Ike can more easily go toe-to-toe with his foes in most MUs offstage.
All in all, a decent match but one that you could have really dominated with some tweaks.