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There's not really any extra strong interaction between Choco and Keeper of the Nine Gales, but Choco wants to be attacking with as many birds as possible, so the basic synergy holds

At the cost of 2 colourless, 1 red and 1 white mana, you get a 4/4 Human Warrior with the power to add Human creatures to the battlefield anytime a non-Human creature you control attacks

That can depend on which of the trading card game's ink types you favour: do you like the fun combo potential of amethyst

Choco, Seeker of Paradise has an attack trigger that reads: Whenever one or more Birds you control attack, look at that many cards from the top of your library