Top 5 Best Water Themed Transformers Toys
5. Transformers Energon Sharkticon
This is a perfect little guy which marks a start to the golden era of quality deluxe class figures from Hasbro for vehicle Transformers (which lead into Classics, Cybertron and Animated). This is an inventive design combining the beast like elements of a shark and a submarine vehicle, making it beautifully Cybertronian. The Transformation is simple but effective, making both the robot and vehicle mode quite distinct, with different shapes and details. The articulation is as good as today's toys but the plastic is better and the pop out firing missiles in vehicle mode is a nice touch on this awesome figure which rocks one of the sweetest decos I have ever seen on a Transformers toy.
4. PCC Undertow and Waterlog
Every one of this toy's three modes is fun. It is hard not to like a speed boat with gattling guns. The green clear plastic cockpit (and robot-mode visor) is a nice touch which adds to the water theme and the light blue combiner ports dont take that much away from this figure as it does others since they end up looking like cybertronian breathing tubes in robot mode. What seals the deal though is the combiner torso which has a steam punk diving bell helmet, going all out on the water theme. And if that wasnt enough, you get the most distinctive minicon partner in the entire line with Waterlog. His more humanoid look makes him a cross homage to both the Centurion toy series, from Kenner, as well as Microman thanks to that clear turquoise plastic he is partly made of. He also doubles as a clear turquoise chest shield, making this really resemble some Microman toys. To have all this awesomeness crammed into a scout class Transformer is quite a rare thing these days.
3. Transformers Hunt For The Decepticons Sea Spray
Who would have thought little old G1 Seaspray would one day be the hulking bad ass he became with this toy. While the alt mode pays homage to the small G1 toy, the robot mode goes for a more streamlined movie look crosed with more traditional and smooth robot designs. I especially like how smooth the alt mode is, it looks so clean with every part connecting together flush that you wouldn't expect it to turn into a robot. But it does and you wouldn't want to mess with it due to the wide upper chest and shoulders and face plated robotic scuba helmet. But just to show you he also has a fun loving side, you can flip flippers from the underside of his feet and he has a fold down ramp in vehicle mode for him to accommodate any scout class Autobot who would need a ride across the pond. In the end I just love the look of this figure and how accomplished it is as a transforming toy which has no unnecessary kibble in either mode.
2. Transformers Beast Wars Metals Depth Charge
There is just so much win with this toy from the headsculpt to the metal manta ray alt mode with a deco that just pops. I like how beefy he is as a toy and I really like the opposite sides of the manta ray face becoming the legs, along with the how glorious he looks with his wings in robot mode. He also has a very fun central disc launching gimmick which works in all modes. If that wasn't enough, his tail becomes a harpoon and he has a shark drone which can fire missiles. Definitely one of the most fun toys of the Beast Wars era.
1. Transformers Beast Wars Cybershark
An extremely efficient transformer whose body length shell serves as a great disguise to a very poseable robot. The shark mode has beautiful deco which looks as good as any plastic shark toy found in toy stores in the 90s. What is amazing is that, despite it being a shellformer, it has great alt mode integration that is very reminiscent of traditional transformers with having the head of the alt mode as the chest. A main aspect of the original toys that make up what we call G1 was the disguise component and how they could infiltrate other toylines which didn’t transform. With its phenomenal alt mode, this sharkformer is a perfect example of this legacy. The deco on this toy is as masterful as that headsculpt and he comes armed to the teeth with extra shark themed projectiles (that can be stored within his back) and his pincertail. Of course, that is aside from his hammerhead shark head which he can shoot from his body!
Honourable mentions: Revenge of the Fallen Depthcharge, Energon Mirage, G1 Octopunch (he was the first with the deep dive helmet), and Legends Gelshark.
And of course, a water themed list wouldn't be complete without a mention of Transformers Armada Tidal Wave!!!!!!! The main reason he didn't make it is because while his name was very much "Check me out, I am water themed!", I found the toy far too Cybertronian looking that it didn't fit the water theme the creators were probably going for, aside from the aircraft carrier component. The Battleship mode looks more meant for space travel than going across the sea.
Water theme fight!
That awesome photo was brought to us by Daniel Cole!
he may not be known as much as his transmetal upgrade (or more appropriately, who that toy was re-released as) but he's still quite fun and I love how his transformation method is the same as the smaller releases like iguanus and terrasaur. 
Thanks for putting him on the list WJ! 
I'll look into the commerative edition, at one point I was going to look for God Poesiden, but prices weren't favorable 
