I like the Tropical Stout idea. I'm in for 5, 10 if we need to cover it. I'd probably brew 10 gallons in any case so it's no hassle. From the BJCP:
16C Tropical Stout
Overall Impression: A very dark, sweet, fruity, moderately strong ale with smooth roasty flavors without a burnt harshness.
Aroma: Sweetness evident, moderate to high intensity. Roasted grain aromas moderate to high, and can have coffee or chocolate notes. Fruitiness medium to high. May have a molasses, licorice, dried fruit, and/or vinous aromatics. Stronger versions can have a subtle clean aroma of alcohol. Hop aroma low to none. Diacetyl low to none.
Appearance: Very deep brown to black in color. Clarity usually obscured by deep color (if not opaque, should be clear). Large tan to brown head with good retention.
Flavor: Quite sweet with a smooth dark grain flavors, and restrained bitterness. Roasted grain and malt character can be moderate to high with a smooth coffee or chocolate flavor, although the roast character is moderated in the balance by the sweet finish. Moderate to high fruity esters. Can have a sweet, dark rum-like quality. Little to no hop flavor. Medium-low to no diacetyl.
Mouthfeel: Medium-full to full body, often with a smooth, creamy character. May give a warming (but never hot) impression from alcohol presence. Moderate to moderately-high carbonation.
Comments:Sweetness levels can vary significantly. Surprisingly refreshing in a hot climate.
History:Originally high-gravity stouts brewed for tropical markets, became popular and imitated by local brewers often using local sugars and ingredients.Characteristic Ingredients:Similar to a sweet stout, but with more gravity. Pale and dark roasted malts and grains. Hops mostly for bitterness. May use adjuncts and sugar to boost gravity. Typically made with warm-fermented lager yeast.
Style Comparison: Tastes like a scaled-up sweet stout with higher fruitiness. Similar to some Imperial Stouts without the high bitterness, strong/burnt roastiness, and late hops, and with lower alcohol. Much more sweet and less hoppy than American Stouts. Much sweeter and less bitter than the similar-gravity Export Stouts.
OG: 1.056 – 1.075 IBUs: 30 – 50 FG: 1.010 – 1.018 SRM:30 – 40 ABV: 5.5 – 8.0%
Commercial Examples: ABC Extra Stout, Dragon Stout, Jamaica Stout, Lion Stout, Royal Extra Stout