Fast Attack
Now it is the 9th Edition of Warhammer 40,000. The Death Guard is the codex of choice for most Nurgle players but the regular Chaos Space Marine Codex also has Nurgle in it, as the does Codex Daemons, but I've tried to stick to just one book, which now has many Fast Attack options, none of which I own let alone painted until I finally did up a single Chaos Spawn for our upcoming narative campaign the Siege of Vanithro's Bastion.
Chaos Spawn
The link above does a pretty good job of explaining how I painted the first one. I plan to paint more until I have a squad of five. I like big squads especially for models that are cheap and have no guns so no reason to stop advancing. I may even use one of the new Beast of Nurgle models but there is actually a lot of variety in the Chaos Spawn kit.
Inconceivably at some point GW made Beasts of Nurgle fast attack, but then GW giveth, GW taketh away as now they and even worse Nurglings are only in the Daemon Codex. I also rebased mine and don't want want to rebase them again, so I'm not sure they'll see much use in 40K unless someone challenges me to a really huge game.
Briefly there was a time where Nurgle renegades could both have heavy weapon troopers and dudes with jump packs and bikes. I used to use Nurgle characters at least with both jump packs and bikes extensively in 2nd Edition. Now it is seven editions later and I'm not even sure I played them all, but depending on what the as yet unreleased newest Chaos Space Marine Codex says I may paint up two more bikers to go with Isaacous, but I have no immediate plans to do an entire squad of Nurgle raptors. Most people seem to love raptors with an icon or without, but I've always been a contrarion and I need anti-armor more than assault troops, plus currently I'm trying to stick to just the Death Guard Codex.