New Year Takumi with -Atk, +Res or -Spd, +Def

I too have a -atk takumi. You really need the speed to get doubles and with a slaying dagger, most of the time he'll be using his special. Also having the +res allows you to make a sorta mage tank build with his default atk/res bond. +def doesn't really help in any situation. I'd say that +res -atk is your best bet.