The only instance of suicide general I have found was when a Mecedonian General frontally charged my Hoplite Phalanx in some tight city streets, but he deserved it!

I once had a battle in my Julii campaign where my AI reinforcement army was larger than the one I was in command of. My other general started off on the side of a hill, I started off right at the bottom of it... Where was the enemy? Thats right at the top of the hill.

My reinforcements reached them first and their lines clashed, while my men were still slogging their way uphill. I was impressed to see that my general did not charge in right away but sent in the Equites first on the higher ground and outflanked the enemy...

By this time my army finally came up the hill and engaged on the other flank and the Gauls ran away Screaming like little girls. The Hounds were released, and the foxhunt-like scene began.

I was very impressed with how my other army fought in that battle, I almost didn't get a look in til the end!