What is the feature you want to see?
Using interact on player triggers Luigi speech (eg Luigi talking in Mario & Luigi games) and animation. (If talked to player is dead, revive; this already is a thing, but uses a villager.)

Why would you like this feature?
Interact is used to talk to E. Gadd, Toad and Madame Clairvoya, but does nothing when aiming at players. It'd be fun if something unique happened

Any alternatives you've considered?
N/A, this suggestion is just to fill in an empty area with an non-impactful feature.

Additional context
https://themushroomkingdom.net/media/mlpit/wav Luigi gibberish entries (high health) and crying 2/3 (low health)