And one more ship from my concept based on Winx Club animated series dedicated to fix mistakes and expand lore of the series. Here goes the Poseidon-class battlecruiser, the backbone of Kingdom of Andros navy.
This class is designed to operate and fight in air, space, underwater and even such hazardous environments like gas giant atmosphere. Like other battlecruisers, this class' purpose is for direct combat, patrolling and field command center. This is a brand new ship, like many other ships (probably aside from Eraklyonian and Solarian big vessels), being built and deployed to counter different threats across Magic Dimension (Darkar's forces, criminal sindicates and others). The particular ships of this class shown in render - the Gorgol, named after Andros underwater star from season 8 of Winx Club - acts as a flaship of the Kingdom of Andros. It will be given to one of the Winx - Aisha (Layla) - to command, with Nex being her first officer.
It features smooth hydrodynamic design which tells about ability of the ship to effectively operate underwater. Its blue plating is specific to all Andros big vessels. Primary weapons are 4 circular multi-directional laser emitters. Secondary weapons are over 80 plasma turrets. No visible shield generators, they are hidden beneath the hull. This class has only two main engines. As an Andros big vessel, the Poseidon-class also contains sections suitable for underwater natives of the planet of Andros. Large window at the aft ventral hull is the habitat section for them, filled with water. This ship also has a single hangar on ventral hull, its capacity is lower than Condor-class battlecruiser's single hangar.
Main sources of inspiration are the X-Jet from Marvel comics' X-Men and Wells-class temporal ship from Star Trek.