A really fun champion
i have collected ip and i should soon have 4.8k ip
so i would really like a fun jungler which of the following do you think is the most fun?
j4, noc, wukong, trundle, voli
or just swain 
i have collected ip and i should soon have 4.8k ip
so i would really like a fun jungler which of the following do you think is the most fun?
j4, noc, wukong, trundle, voli
or just swain 
I would go with Wukong. He's really fun, and you can also play him top lane.
nocturne is the only jungler that doesnt run into super frustrating teamcomps and scenarios, at least from your list. i can also recommend shyvana and master yi, as they are basically the same as nocturne but more powerful
If your talking about fun to play then I would suggest cho gath. Cho gath has really good sustain in jungle and top lane. His q can knock up enemies allowing escapes or minion clearing. Once he gets a 6 stacks for fest, he has a lot of health and it's really funny trying to see someone try to 1v1 you. It depends on your playstyle. Out of the ones you suggested, I would go for nocturne.
I did not know swain jungle was a thing. I guess I should try it out lololol! If you want fun, go with wukong. If you want wins/elo, go voli, shyvana, or olaf. Those 3 are my main junglers, and I cannot say anything negative about any of them. Plus, great streamers main them. Nightblue3 plays a lot of voli, TheOddOne plays a lot of olaf, and Cowsep plays full AD shyvana but there are plenty of shyv junglers. Check out tekk on youtube, he features pro streamers in all of his videos!