Fun discussion, here are my faves (only considering the once i own)
* /psy Marco (just an irreplacable unit so glad i pulled him early on)
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* /str 3D2Y Zoro (finally got him recently, just pushes slasher teams so much further)
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* /qck Leo (delay and orb lock in one is always nice but 20% cut on top of it really pushes him as a unit)
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* /qck Sugar (another pretty irreplacable unit, just very handy and her OTK team is so fun to use )
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* /int Ivankov (was my only free spirit captain for a long time + the special is amazing for forests and he's my go to poison remover)
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* /int Vergo and /dex Kyros (they are pretty handy for Kuzan teams as they can take care of the pre boss coli stage or the boss stage itself, i mean cavendish is super powerfull and these are just weaker versions of his special )
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* /psy Impact Dial Ussopp and /int V1 Robin good old 2x boost ^ alltough I don't find myself using Int teams at all, they used to be what carried me trough the early stages of the game so Robin is my OPTC Box Waifu for ever :D
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* /qck Jabra and /str Sanji as well as /psy Squard and Senior Pink (they are all just great orb boosters that i love using over doffy for one collour teams)
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* /psy Monet (Delay and conditional boost in one is cute, but i mainly loved her for the easy evolver unit clears, nowadays i just use don kriegs ship with double drop captains)
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* /qck Ideo and /int Onigumo (are units i just pulled last sugo and haven't played around with yet but i expect them to be super useful as well) there for my number 10 spot would go to /dex Koala (alltough I never use fighters)