Luigi is a CPU Mii.
Wii Sports
In Tennis, his skill level is 3600. He teams up with Mario or Theopoulos. In Baseball, his skill level is 1712. In Boxing, his level is 2000.
Wii Sports Resort
In Swordplay, his skill level is 11999. He is also the boss of Level 42 in Swordplay Showdown. In Basketball, his level is 11908 and plays with Mario and Shane Dawson. In Table Tennis his level is 11999.
Wii Sports Club
In Baseball, his Grade is ★7 and he is a PRO. In Tennis, his Grade is ★10 and doubles with Mario. In Boxing, he is decent, with a Grade of ★3.
Wii Party
In Wii Party, he is an Advanced Master CPU.
Wii Party U
In Wii Party U, he is also an Advanced Master CPU.