Any ideas for building a speedy Grima (+spd, -res)

Honestly, I would say it isn’t worth it, because he is mainly built as an enemy phase unit. Even with +Spd it’s only 27.

His speed is beyond unsalvageable and with vengeful fighter he doesn’t have issues doubling. My little brother has the same IV but i said just build him standard unless you roll a better one.

Is it worth it? NO!

Grima and his base kit is built for that of an enemy phase unit. He will always return punches when he's above 50% health with vengeful fighter along with that he gets a cool down bonus.

Your Grima's speed at 27 even with extra speed of lets say +3 from some A skill or +6 from Hone dragons gets him up to 36 allowing him to barely double units.

His -Res can be patched up with your other units running dual rally def/res, ward amour, drive res etc.

In summary build on Grima's actual strength, which is enemy phase bait killing.

Speedy no, it might just enough that he won't get doubled. Slap on Fury 3 as his A skill and pair him up with spd buffer or spd debuffer and see if you can make the speed difference less than 5.