I might have seen that basing thing before (but if you find the pics I'd love a link). At the moment my part painted Seaguard are on more traditional basing. But I have a box of unpainted seaguard and I have been thinking about going the wave route with them. With a transition of the front ranks in the water, mid ranks on the beach, and the final ranks on the land (if it gets used in horde formation). But yeah the waves and the rock is definitely the way to go with the Sea Helm.
Ditching the fish and keeping it as a 'nice bit' for another project is the sensible thing to do. But lets explore the madness place:
https://imgur.com/DweB5IlHow about cutting the head off and clipping some of the other parts so that it fits in the middle of an Annointed's helemt and makes it all fish themed. We'll cut out the middle of the helmet and replace it with the fish body so that the dorsal fin faces outwards the same way the elf's face is pointing. Big downside is it could look too organic in the end.
https://imgur.com/K6XpTHMPictured with a more sensible helm here. I can get a bow and quiver and maybe a cape on him but it is a bit of a tight fit.
I could also drop the cape and the bow and use this spear and helm bit I think comes from the bolt thrower kit.
https://imgur.com/NWdJfvkI've tried posing the model with a few different weapons but so far the only thing that really works with rank and file is the Annointed's halberd (on foot version) and maybe a Phoenix guard halberd. So I think defaulting to the hook is how it is going to be.
The mage thing is for a different model I received when it first came out Lotann:
https://i.imgur.com/z0AFI8H.jpgHis problem is that he's way to big for a 20mm base and needs the 40mm square. On the other hand I can build it up as a rock pool and use him as 'filler' representing himself and 3 absent Seaguard. Possibly have him as detachable so that if the unit dwindles to the front rank I can place him on a 20mm (that won't have to rank up against rear ranks at that point. I guess I could also buy a second model and vandalise the octopus off of it to make a beaten up version for when his bunker has been cracked.