From the Super Mario Wiki
Izzy, the Piranha Plant co-host from The Play Nintendo Show

Izzy is a Piranha Plant who is served as the co-host of The Play Nintendo Show along with Andrew Trego. Izzy has two leaves, which served as arms and has a comic relief. Izzy supports him throughout the show with segments including "Andrew & Izzy's Top 5". Before lunch, Izzy gets a bit snappy.