Building A Gladiator!

Alrighty then! So I was planning on making a gladiator but, I am trying to figure out how I should build the character. At first, I was thinking of using Katzbalger so for first 100 levels, I will work on about 110 vit and 200 crt. Once after that, I was going to focus on my str. Would that work out and once I build enough str, I can switch to red tengu. The possible equips i kind of want to use is:

Armor:
Shirioto Up
Dunkelheit
Schwartz

Weapons:
Helshaft
Katzbalger
Red Tengu

Additional:
Horn Helm up

Special:
Rose Ring
Knight Guantle

Also, would a magic sword berserk gladiator be a good idea? Would it even be beneficial or would it just suck? I think with Dunkelheit, it could possibly be done though. Please Advise.