I have a few ideas


Sparafucile: Lucien Lachance
Siegfried: Thor (he steals Donner's hammer. Donner runs to Wotan crying. Wotan wearily stares into the distance and shrugs)
Don Giovanni: Commander Shepard ('We'll bang, okay?")
Manrico: Jaskier / Dandelion
Werther: Ebony Dark'ness Dementia Raven Way
Alvaro: Túrin Turambar