Okie dokie. I've fought some jiggs before, probably the mosting annoying thing is pound spam. (pound spam where i mean, they retreat, pound etc).
Well this matchup is between who makes the most mistakes. If luigi makes a mistake on missing a shoryuken, then a rest will **** him in the 60%s fresh. If jiggs makes the mistake of missing a rest, then shes going to die from a shoryuken possibly late 30%s or early 40%s.
Luigi's Ko options mostly **** and are open. Fsmash is his strongest one which kill around 60%s or 70%s.
Upsmash/dsmash come out around 80%s-90%s. Nair ***** hard (i forgot what %, maybe 90%? possibly early, but he does kill Jiggs early tho).
Luigi will **** Jiggs in the air alot. Dair to Nair, to utilt (utilts alone = 20% or 30%) and you got yourself a ****** 40% which is in a shoryuken range. Spacing from Jiggs with alone Bairs/Fairs/pounds is a must.
( I think Luigi outranges/outprioritizes her in the air no (?) )
Anyways, you can actually SH pound your way from fireball spam or if Luigi SH fireball walls, you can just run through it because of how short she is.
Approachs from luigi : Fireballs, tornados, Dair to Nair (combo starter initally) Bair.
Air tactics : all of luigi's aerials will be used, upair/fair are the short ranged ones and pratically his blind spot, and mostly used in strings. Dair/Bair/Nair = combo starters, kills and spacing.
Ground tactics: Both are pretty equal here, Luigi's ftilt is a space tool, Dtilt trips you, meaning a free shoryuken, utilts is 30% racking up damage. And Jab cancels are alot here too. Fireballs also here as well.