Well not sure someone ever posted this befor, but anyhow this is the stats from Arigato's summon ( OLD foum meber banned ages ago for stupid reasons )
http://lineage2.mugimugi.org/SummonStats.htm
Note: The table at the bottom listing Normalized Patk is the effective Patk that the summon would have if the attack speed was normalized to 370, the speed of a self-buffed shadow
It is calculated by the formula [Summon Patk] * [Summon Atk Speed] / 370
The second table lists the same information in percent form. A normal, non-critical hit from a Prophet+BD buffed soulless will hit for 65% more damage than a self-buffed shadow.
The Different buffs: (All highest lv)
Prophet: Wind Walk, Guidance, Focus, Deathwhisper, Berserker Spirit
Blade Dancer: Dance of Inspiration, Dance of Warrior, Dance of Fury
Self Buffs: Servitor Might, Servitor Shield, Servitor Haste, Servitor Mental Shield
I belive they all apply true between all summoners to, can't 100% confirm it but it have ben the case from what Iv'e seen befor.