Ok then sir. kinda tired of being a lil playful in my post so people don't think I am always serious in them cause, well as my sig says. So I'll just straight up Post. Now as for your questinon.
Yes Peach is not one of the best killers. But I tell you this, Nether are characters like Falco. Yet cause there is a lot more to this character, he can make up for it. I'll let Falco players explain that situation.
First in the words of Mikey Lenetia:
"One thing to use an aggressive style is to know EXACTLY when moves will work and when they won't, and not limiting yourself to only a few moves because of them not doing a lot of damage.
Jabs, dair, turnips, dash attack, grabs, everything HAS to be used so that when you finally get around to the higher percents, they'll do a heck of a lot more. Don't worry about using powerful moves, but... don't abuse them. What I mean by what I say is that you have to have a mix of the weaker attacks that don't send far(including down smash, I CAN'T STRESS THIS ENOUGH, it's useful!) with the ones that do.
That way, even though you're aggressive and moving in and out of range, they really won't know what's going to come out. Also, the most important point that goes for Peach, in my opinion, across the board. Just because they're at percents that things like fair and usmash will kill doesn't mean it's then time to break out the killers. One, to keep them guessing even more and making it actually easier to land a fresh killer. Two, you also build enough damage so something they don't expect, like say uair, will kill."
Now words from me:
Save your moves that you need for killing. Use lots of jabs, get damage off of grabbing. When you grab them don't always launch them so fast. Kick them a few good times then toss them. N-air cant kill so well so use that alot. Dair helps since its not a Kill move. Space dtilts. And turnips. Once you get them to a good % Now you can fely on your kills moves like Fsmash and Up smash. Your fair and bairs, even upairs. uptilt as well. Try to save your most important moves to kill. Cause when you get them to that good %, all of your kill moves will be at full power. And it will be less of a struggle to kill.
Also Her upthrow can be a good tool for Killing.
"What, an Upthrow? the hell, How, that throw sucks and people hardly use it."
Oh? Well let me explain. At 50% and over, you really can't combo into anything. if you was to Fthrow them and Back throw them, then what. They are out of your range. and have to repeat the process of approaching them again. When you up throw them, They are over you, you can use turnips to at least hit them, or make it harder for them to touch the floor. And set up to land an attack on them. This is the more better ways to hit someone after a throw. This is center stage though. Near the edge you can just toss them out. but with some characters, Like DDD, DK, you are not gonna kill them off of a throw. So the hell with that right? Toss them up and get extra hits of of turnips, and even if that dont hit, they have to worry about evading them and then you hitting them while trying to land saftley to the floor. They will still Be in your attack range for turnips and even finishers more than any other throw at 50%+
Also she is good at racking up damage in w ways. Her Attacks and turnips. If you are gonna spam anything. it should not be your fair. it should be:
-Nair
-Dair
-Dtilt
-Jab
-Dsmash
-Turnips
-Grabs
-Up-B, used right and I am dead serious. 12% of damage I believe and good knock back at the final hit so you can't get punished for it that easy.
-Bair (sometimes.)
Uptilt (sometimes)
Uair (sometimes)
Now look at this list here. What is missing from here? Thats right, her kill options:
Fair
Fsmash
Upsmash.
The moves that have (somestimes) in them are moves that can kill as well but sometines are used to rack up damage, like within comboes. Now when I say spamm I don't mean be a dunce with the moves. uses them wall and with a brain to get some hits off. Then you still got your kill moves to kill earlier than expected. You can't just play Peach to play her. if your character can't just boldly kill, you can;t just go swinging attacks and playing so typical. This is why Peach does not get anywhere and people don't really see what she is about. Thus she is bias on her self and against characters. As well as people saying the typical stuff about her for over a year now.
"how can Peach rack up damage quick and early?"
Besides the chain grab we have:
Basic combos
-Dthrow>uptilt
-Dair>Nair
-Dair>Uair
-Dair>Fair
-Dair>Bair
-Jab>Dtilt
-Jab>grab
-Jab>Nair
-Jab>Nair
-Turnip>fair
-Turnip>Nair
Advance combos ( you would need good control of Peach and her floating as well)-
*= Depends on where your enemy is/goes after the first or second hit of the combo
-*Dair>Dair>Fair
-Dair>Dair
-Dair>Dair>Dair
-Dair>Dair>Dair>Uair
-*Dair>Dair>Dair>Uair>Up-B
-*Dair>Dair>falling Dair>Usmash/Utilt/Up-B
-*Dthrow>Ftilt>Uptilt/Usmash/Up-B
-*Dthrow>Ftilt>Jab>grab>Dthrow>Utilt/Uair/Up-B
-Bair>grab
-Fair>Jab>grab> (look at the list of what you can do after grabs)
-*Falling Dair>Jab>(look at the list of what you can do after jabs/grabs)
-*Falling Dair> Usmash/Utilt/Up-B/Nair/Bair
Now look at the list of moves I said to use alot that have (sometimes) in them. Then look at the combo list. Makes since to why it has (sometimes) next to them right you might already be using the move to get damage. So the won' be fresh for kill. other times they will.
Peach is like Chess, you just CAN'T go in there and say "ok, I wanna get this pawn with my rook" When there is a pawn right by it that can take you out. Now in Brawl terms.
You can just go swinging all your kill moves and all. You can get all the hits you wan't. Then when you get to that kill %, you are in trouble, you can't kill them at % they should be dead. And that sucks for you, and you already not a solid killer. oh man. then your enemy is gonna take you out easy. So you have to think how you gonna keep them kill moves fresh, and get your damage by new means. Peach and chess have something in common so you know.
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Thing that finishes up about Peach and killing. Ok, so what else is next that I have to explain?