There are some really cool controllers out there nowadays. MPE controllers such as LinnStrument and Seaboard (see Fav synths and VIs for playing with MPE instruments), which are cool for live shows if you have some practice and talent playing, but there are also simple XY controllers out there and similar stuff that could be cool for live shows imho, such as:
- Source Audio Hot Hand
- mi.mu gloves
- KMI QuNeo
Also, maybe consider some interesting pedals such as KMI SoftStep or a drum pad like the KMI BopPad.