Luigi is ranked 38th on the version 22.214.171.124 tier list, placing him in lower low tier. Luigi has an amazing combo game, with almost all of his aerials aiding in it. Forward and up air are used to extend combos, neutral air does the same but is usually used to break opposing fighters' combos or launch upward and down air can be used to spike or edgeguard. His forward air, for some reason, also deals a whopping 15% per hit unstale. His down throw is the icing on the cake, though, as this move sets up almost all of his combos early-percent and his dash and pivot grabs are safe due to Luigi's almost nonexistent traction. He also has some gimmicky, but extremely strong finishers, such as Luigi Cyclone near the upper blastzone after a combo, a sweetspot Super Jump Punch, a Misfire (this sometimes happens when you use Green Missile, pure luck), or an up smash. All this makes a skilled Luigi quite dangerous.
However, every character has drawbacks, Luigi not excluded. His combos are harder to use against floaties such as Samus and Peach, and characters with fast moves can escape his up and neutral air. He also needs to get a grab, which can be pretty difficult since Luigi is a slow character. Defensively, he also falls short. He has bad ground speeds, low gravity and bad range outside of Fireballs. A big problem to him is shieldstun. If he gets hit by a strong move, he slides away and can't escape shield because of that low traction, which can lead to a punish. Most if not all of his finishers, as previously stated, also require luck, a combo or hard read to pull off. His up smash has decent range, but not Ichigo or Black Mage level, his sourspot Super Jump Punch only deals 1%, has next to no knockback, and can lead to a hard punish or even a kill if missed. Green Missile is quite weak without a Misfire, and landing a Misfire requires luck. Luigi Cyclone's last hit is not as easy to hit as Mario's, because it only has two hits. The first hit rarely combos into the second one.
Luigi is quite a gimmicky character. He has extreme strengths, but also glaring weaknesses. This makes him a very balanced character. However, his playerbase saw extreme drops over the course of the last updates, with no one to get notable placements in tournaments. This explains why Luigi, despite his balancedness, is ranked almost as low as Naruto, literally the worst character in the game.
Standard: Does various humorous poses very quickly in a set order: Faces the screen with one hand on his waist, makes the peace symbol, turns to the right slightly pointing his hands that direction. Then, he places his right hand just below his nose, after that, he turns away from the screen, crouching, as if he's sad, and finally, he faces the screen once more, with both hands on his face, giving a frightened look, similar to the box art of the game Luigi's Mansion. He also makes a sound during each pose: "Hoh! Hah! Hee! Hey! Hoo!"
Side: Stands straight up with hands on hips, falls forward stiff on the floor, then seems to balance himself back up again. He says something that resembles "Pow pow".
Interestingly enough, Luigi position as a starter character in SSF2 is similar to him becoming a starter in Smash 3DS and Wii U.
Luigi is one of (currently) five characters to have his availability status changed (he was an unlockable character in the original Super Smash Flash) the other four characters (so far) are Mr. Game & Watch, Lloyd, Naruto and Jigglypuff.
Luigi, along with Yoshi and Link, are the only characters so far to wear their default costumes in team battle when they are on the green team.
Luigi has a slight purple accent on his overalls. This is a reference to his design in Super Smash Bros..