First off, let us be very clear on this.
who debuted ( Thanks Gopalakrishnan for the update. This is historical ! ) along with Monisha Unni in Nakhakshathangal (1986) is Saleema. As in S-A-L-E-E-M-A or S-A-L-I-M-A, depends on how you want to look at it. Not Saleena nor Salina. The emphasis is M, and not N. Vineeth Nambiar had debuted in IV Sasi’s Idanilangal in 1985, so, this ain’t technically his debut film. The one that made him a household name, maybe.