In excess of requirements, but with some geographical spread:

@ai6yr

@thejapantimes

@sundogplanets

@Jgbird

@TarkabarkaHolgy

@Nonilex

@geofon

@fulelo

@Remittancegirl

Also, to demonstrate the hashtag following innovation, and to cut across a sampling of other accounts, they should automatically see (#)

Caturday
FensterFreitag
Libraries
BloomScrolling
SilentSunday

"Oh, you're a fan of Mastodon? Name three accounts."

My excuse is that it's early, and the coffee is not doing its
job.
@oblomov

Useful? Hmm...

@catsalad is the _Tom Of MySpace_ of Mastodon, so I think everyone already follows them. I'll think of two more...
@oblomov

Random Mandelbrot
@mrandelbot

there's probably others but the Mandlebrot set is great

I don't follow Eugen and I fail to imagine why most folks here would bother.

But anyway ... I'll give a not as well followed one.
@toomanyfoxes improves my timeline. Yes it's a robot account but, unlike most wildlife image posting robots, every image has full attribution ... and the creator generally responds when I post comments.
Mekka. You should follow @mekkaokereke
And the Alices. Both of 'em. Lockpick Alice and hot dog Alice.

Alice
Catsalad
Feditips
Norcalgma2

Have 4, I am feeling generous today.

Yes I didn't tag them on purpose (didn't want to clog their notifications)