

The SDF-1 Macross from Super Dimension Fortress Macross.Present on the eponymous mecha of Space Runaway Ideon.The fact that they're called Fin Funnels only gives bonus points. The ν Gundam (Nu Gundam) has its funnels.◊ And in this case, the fins come mounted with cannons in addition to the standard thrusters. And the Rick Dias' successor in Mobile Suit Gundam ZZ, the Schuzrum Dias, takes this to ridiculous proportions.In this case, they function as either extra "limbs" for zero-G maneuvering, or thruster mounts. The Rick Dias, ◊ the Hyaku Shiki, ◊ the Dijeh, ◊ the Gundam Mark II, ◊ the Hizack ◊ and the Palace Athene ◊ in Mobile Suit Zeta Gundam all have large fins on their backs.Grendizer itself had hints of this, sporting long, sharp, circular blades sprouting from his shoulders. Many Warrior Beast from Great Mazinger and Vegan Saucers from UFO Robo Grendizer had Vertical Mecha Fins. One example is Baras K9, that had long and pointed shoulders were part of his Jet Pack. Mazinger Z: Although the titular Humongous Mecha itself had normal shoulder pads, several Mechanical Beasts had Vertical Mecha Fins.in this case, they house rocket boosters and storage containers for Buster Shield, Buster Tomahawk and Buster Homerun.
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Gunbuster, another series by Gainax, has this too in the eponymous mecha.They're also located where the Evas' angel wings seem to sprout from.Unit 01's knife is now so big that it barely fits in the fin when folded in half and, Unit 02 not only has two knives, just as big and in both shoulders now, but also retains its spike cannon from End of Eva, now in both shoulders. Interestingly the fins are made much smaller in Rebuild as part of the less exaggerated more human proportioned redesigns, yet the fins store even more stuff in them now.Rebuild of Evangelion continues with the second set of arms Unit 03 grows in their place, Unit 02's Beast Mode purging them to eject its limiters, and Unit 01's ascension to godhood once more.
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Such changes include when the Unit 01 gains an S2 organ in the TV series and performing the Third Impact in The End of Evangelion.



Neon Genesis Evangelion, being the former Trope Namer, has this in spades.
