Ok gonna go over things I try to avoid vs her and why.
Not have her in my blind spot:
Peach's blind spot is standing out of her Nair range. I can't really do anything to be that much of a threat to you. She has nothing that is really fast for me to be throwing out. Your jabs with luma in this spot is really good and would stop all my attacks. Even a turnip toss. And you can easily cover a roll with jab cancel mix ups and then punish my roll with something. It does not matter what character you are, if I have someone in my blind spot, im in trouble. Rosalina is one of the better characters that cover that well with jab mix ups, starbits and F/Dtilt. You wanna maintain this spot s much as you can. Its a pain in the *** getting out of this situation against a solid player. I can't really throw out a move. I have to be patient. and wait for a time to get out of there or attack if the player leaves one.
How I avoid this? Peach has I say these best movement in the game. I have to stay moving in and out to make it hard what I will do and where I will be. I also use this with mixture of air and grounded spacing with a turnip in hand. Really hard to tell when to go on and back off. If the player is too slow and just wants to stay in one spot alot. This is your chance to go and cover that blind spot. if the player happens to wanna get turnips alot, they usually pin themselves to the ledge. Go near them and have them there.Turnip tosses are not fast. You can jab me or tilt me before I can toss the item. If the player plays to chicken, they will usually pin themselves to the ledge. if you see the playing rolling back alot, slowly follow them and pin them to the ledge. Then stay on top of that blind spot.
Being in the air:
Peach can't really win air battles with Rosalina so much. You have a decent speed bair that bais mines in range. Her Fair is ok and has range. My fair is slow. So having air battles with her is something I try not to let happen so much.I can die early from these wars. Really when returning on the stay. If Peach tries to panic to dairs when returning, you should not have much of a problem beating her out with U/B/Fair. This is a situation I seriously have to take my time.
How do I avoid this. I mix up air and grounded approaches so if you toss out a move and I am grounded, I can punish your landing or get close to you upon your landing and then put you on the defense for me to take the offense. Adding this with Peach sick movement, it just makes it hard to tell wether to cover the air or ground. Giving me better chances to start air pressure like with dairs/nairs and turnip approaches. And can even hit you out the start up of your air moves. When I am returning back n the stage, I am hella patient. I won't really throw out alot of moves. I'll just weave in and out in the air. And go for mostly slick low recoveries. It's harder to hit Peach when she recovers low.
Your goal in this match up is to stay as close to Peach much as possible. The moment you play like a coward is the moment you are giving me chances to go in and pressure you. Your shield options are not good vs me. You really can't throw out attacks out of shield. You are forced to just block and roll. And this is what I look for in players. Then I bait it and punish it. Do not have Peach all over you. Luma helps get out of this mess with nair by a lil. When I am on you, you have to respect me and don't try to mash a button. A smart Peach will frame trap the hell out of you. And Peach has some nasty Frame traps.
You need to guard luma and not just throw her out there. I say have her with you alot. If you ever send luma out there make sure its at a safe distance where Peach is and harass her with start bits. Then move in. Do not just sit back. Or call luma back after (unless you really have to for whatever reason.) Cause the player would be dealing with luma. And might be sleeping on you. This can lead to a tricky approach to get in and catch the player open or defending. Now it is your chance to take the offense.
For custom moves, I would say use the startbit that just shoots one straight foward. This can help deal with her tricky movement and slow her down. Giving you a better chance to close the gap. And her lma teleport. This is really good to catch her by surprise at a distance. The player will be on guard with it. Giving you better chances to move in and close the gap.
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For how Peach deals with you , you can look here so you know what to expect and learn more from my end. Just ignore anything that deals with TLC since that is gone. I have to re- edit the guide.
http://smashboards.com/threads/peach-match-up-thread-sonic-rosalina-luma-added.373319/
I feel the match up is even. If I was to lean it to Peach favor its because of my movement and my many ways to approach. Rosalinas approaches are kinda typical and/or limited. And Rosalina really just can't be throwing out moves. Same time Toad/Fair can easliy send luma off the stage. I feel the match up does become in my Favor the moment Luma is gone. You now have no Out of shield options. And its easier to get close to you for pressure. Just take your time I seriously be careful with luma. You seriously need her here and just don't throw her out there. Peach is one of the characters that can end lumas life quick. She goes not care about hit points here.