Starting from around 80ish% to 110ish% (depending on match up) here's a run down of my mental list of KO options I look for:
- Fresh usmash kills, is fast, and covers a wide area around Luigi. Can bait an air dodge after a dthrow and land a usmash.
- Fsmash kills, and though it can be tricky to land sometimes, it has really high reward for the risk.
- Dsmash can kill and can be charged while sliding across the floor. Can stage spike an opponent hanging on the ledge. Also goes underneath a surprising amount of attacks because he gets so low to the ground.
- Up B can punish and KO at like +60% on the entire cast. Also an OoS option.
- Sweet spot bair kills. It can kill from on-stage, out of dthrow, and, for me most commonly, when hanging off the ledge to intercept an opponent's recovery.
- Cyclone's last hit kills off the top.
- bthrow kills fresh near the edge at around 120-135% or so.
- dthrow -> X. X can be Up B, sweet spot nair, or cyclone, depending on percent, DI, match up. bair also works too.
- dthrow -> dair spike when you get a grab over the ledge (thanks for that, @
Dire Creeper!). Luigi can really put on the pressure and corner someone to the ledge. You'll be thankful you practised this stylish tech.
- Gimping with fair, dair, dair spike, bair, and cyclone (if you can rise with it).
- Misfire KOs earlier than Up B and it's not hard to sneak a couple missiles in during a match, and can be combo'd into. Nope, it's not reliable, but giving yourself as the chance for easy, undeserved KOs is a pretty fun, and not something to completely ignore. I was in a tournament last Saturday and literally 0-death'd a Link with dthrow -> dbl fair -> jab -> dthrow -> fair -> misfire.
Luigi has lots of options and set ups. If you're getting everyone to 150% before KOs ... great! You've got the combo part down. Now, it's time to get the finishers down, too =).