If you are pairing wine with Banana, the banana flavours are probably in a desert or banana bread.
Since you are eating a sweeter dish, sweeter desert wines, or fortified wines will work well. Port, Ice Wine, Sauterne, Muscat, and sherry are all excellent choices. A sweeter Rose, or a semi dry sparkling wine would be exceptional as well.
Beer & Banana Pairings
An Imperial Stout and Banana bread go quite well. The dense, fatty, richness of the cake is enough to protect the palate from the aggressive bitterness and alcohol of the beer, allowing the flavours of the two to integrate. If you are eating a desert with a bit of banana in it, but has other fruit flavours as well, try a hefeweizens, dunkelweizens or weizenbocks, which all have banana and clove profiles.