-hp +spd sigurd

I have a +spd Sigurd as well and he can pretty much use his base kit. If you want him to be supportive, he can run cavalry buffs. Bonfire is a good special for him which he could use well with his Close Def. Finally reposition or draw back to assist with.

Mine's +Spd(though -Res) and he runs quite well with Aether and Heavy Blade Seal. Granted, he's a member of my mixed Arena team, so I also gave him Atk Tactic.

If you want a good budget build, give him the Close Defense seal and keep the rest of his base skills(swap in a cavalry buff if he's at the horse races)

Bonfire special
Reposition
Calvary buff skill
Pretty basic actually