Budget build for a +Atk, -Hp Halloween Niles?

He already comes with a good (almost) complete build, so try his base skills first, see if you like them and then think about possible changes.

Yeah, like above post said, the base kit is pretty good on him. I have him too, and i'll probably give him a slaying bow, and just run rest of his base set.

Not sure if this will help, but I do suggest some ideas for hyper-budget.
https://fireemblem.gamepress.gg/q-a/repost-i-pulled-x-halloween-unit-what-do-i-do