The fearful younger brother of Mario, Luigi joins the Recolorbusters after an incident with his plumbing company via what he describes as "a version of him, but in Orange" wrecked up his tools. He's a non-believer at first, but once things get serious, Luigi quickly catches on. Unlike his brother, Luigi is more vocal, but is definitely not as hardened as his science-driven older twin. 

Luigi's voice would sound like the mainline series of Mario games, but with a bit less shakiness. 

Luigi Voice reference: https://youtu.be/U0WQzSFD154

The character Luigi parodies is that of Winston Zeddemore, the straightman of the Ghostbusters. Luigi is not as forward and fearless as Zeddemore is, but he represents the same blue-collar worker looking for a job motif. 

Clips from Ghostbusters as reference: https://www.youtube.com/watch?v=ovjEN6ER9PY

The use of audacity is preferred for audition lines, with lines labeled with your name/social media handle, and line 1.