Here's two special attacks for unison attacks:

Cross Thrust- Use Lloyd and Kratos' Sonic Thrust tech in a u. attack. After the u. attack is done, both will preform a cross thrust (the two use sonic thrust in different directions)

Pow Blade- Use Lloyd's Tiger Blade tech and Colette's Pow Hammer tech. After the u. attack is complete, Lloyd will preform the Pow Blade tech (kinda like tiger blade except with toy hammers)