Is an ally character killed by a Geo Chain count as an Ally Murder
No, they do not.
From the Disgaea wiki on Ally Kills:
Ally kills do not include:
- Killing Specialists
- In Disgaea 2 and later, throwing Prinnies or characters killed in the subsequent explosion
- Throwing an enemy into the Base Panel
- Making a tower of characters, ending the turn and killing a character with the inflicted damage (in Disgaea 1)
- Killing a clone
- Being killed in a Geo Chain
- Being killed by poison , even if inflicted by an attack by the player