First line leaders: How do they help you?

I am curious to hear from individual contributors, especially closers; How would your ideal first line leader provide the most value to you in your current role?

obviously all leaders have strengths and weaknesses. so more hypothetical then based on your current leader's skills.

what would the ideal leader do with consistency, that would be the most value to you?

any horror stories of trying to manage up, where leaders have been way off in their priorities, or great leaders, of course welcome