Ultraman Ace by Medicom
Ultraman Ace's head fin has a great big hole in it and a Beam Lamp up front. Other than Ultraseven's detachable fin, Ace's is probably the most useful fin. The Beam Lamp can fire his Punch Laser and the hole is a place where energy can be gathered, stored or released (it is the nexus for his most powerful weapon, the Space Q). It is also where he emits Ultra Signs into the sky to communicate with other Ultramen.
Not too sure why Ultraman Ace has "ribs" on his back - a little strange even though the Ultramen were aliens from The Land of Light, Nebula M78
Ultra Seven by Marmit
Ultra Seven by Medicom