Well Micheal_The as Walter Dornez is one of my favorite character from Hellsing I may be able to help. Of course as you mmay already know Walter uses monofilament weapons, so a good given is that the techniques may (or may not, your choice) require their use. As for what they do, Indirect attack, Ranged attack, Area attack, Increased damage, Concealed attack, and critical increases might be good canidates for effects. But you must also think walter doesn't show much use of techniques par say, he is just really skilled with monofilaments. But I would say the effects i mentioned a bit ago would be your bes bet. If you PM me I could help you put together some techs that may fit with him.