'Stache or Stache (Horn for Bowser) is a statistic that is featured throughout the Mario & Luigi series. They are similar to Luck, as seen in other RPG games, as it gives Mario, Luigi, and Bowser more chances of landing a Lucky hit.
In Mario & Luigi: Superstar Saga and Mario & Luigi: Partners in Time, this statistic provide discounts for items purchased at shops, and allows players to sell them at high prices. It is also given to Baby Mario and Baby Luigi in Partners in Time, even though they do not have mustaches.
In Mario & Luigi: Bowser's Inside Story and Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey, it has an effect on the type of scratch card the player receives when purchasing items. None of these features appear in Mario & Luigi: Dream Team, therefore the statistic is only used for lucky hits. However, in Mario & Luigi: Paper Jam, it also increases the likelihood of enemies dropping items after battle.
In Superstar Saga (plus its remake), Bowser's Inside Story (plus its remake), and Paper Jam, this statistic can be increased through level ups. They can also be increased through Teehee Blends and Teeheespressos, but only in Superstar Saga and its remake, as well as Stache/Flex Beans, which are introduced in Dream Team.