ok, i know there are probably tonnes of other people asking similar questions but i can't find them.

the characters i have in my team are: 

Fang (commando, saboteur and sentinel. sometimes ravenger)

Vanille (ravenger, saboteur and medic)

Hope (ravenger, medic and synergist)

Can anyone please tell me what the best weapon for these characters are to fully upgrade. thanks for any help :)