While working on the redesign of Hadron. I had to figure out the horn design as well due to there being 4 references of the characters, but each had their own.
So the first 2 concepts were loosely based on the spikier design. The 2nd design retains the spikey appearance but would end up looking more like armor, but having this "F" design on them.

On the 3rd concept, I would trim back the spikes and change up the "F" design as well.
The 4th style was close to what I needed up with and it was just me trying out texture and such.

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Hadron belongs to silverrook