So this year, my school is doing Fiddler on the Roof for its spring musical. They are in need of a fiddler and no guys stepped up for the role so I, as a girl, am lowkey thinking about taking that role. If I take this role but then do nothing else regarding my schools’ theatre program, how would colleges view this? Also, would I get anything out of it regarding college applications?
Being in a theater production even at the HS level is a big commitment of time and energy. It can also be rewarding and fun. Do it because you want to not just to try to bolster your college application.
Instead of thinking: Will colleges like it
You shoudl think:
Does this sound like fun?
Have I always wanted to try theater?
Am I open to making new friends?
Do I have time to do this?
You should explore various interests in HS to see if you like them.
Colleges would see that you were involved in a time consuming EC like theater and did well in your coursework. That is always a plus.
@bopper is all over this. Part of building an interesting EC list is having it actually reflect your interests. If you want to take a shot then go for it. Didn’t you see High School Musical? 
Colleges will see you taking a chance, breaking out and learning new things at all points in your career. They love that stuff. If nothing else it’ll be a good story for your kids.
I agree that it’s not important what colleges think. Musicals are a lot of work, but worth it. I’m currently in pit orchestra for my school’s musical this year and it fluctuates from being the worst and best thing ever (in a good way). I would say do it, you might not plan to continue theater, but who knows, you could get hooked. Maybe you’ll do crew for future productions.