This seems like a super fun topic, but a bit difficult. From the series I'm aware of, I'd rank them as followed:
Goku: Should be self explanatory, but if not, he's capable of easily destroying planets.
Toriko: I'm not going to lie, this probably has something to do with my bias towards this series, but I'm pretty sure he's fairly stronger than the rest of the folks on my list, sans Goku, who is still quite above Toriko in power.
Ichigo: Not really sure I can explain this one really well. I just feel like Ichigo is the minimum "Height Requirement" for power scaling, despite a lack of many measurable feats. His universe, along with the characters' above him, seem to have a larger power scale in general.
Naruto: F**k Naruto. Now that that's out of the way, EOS Naruto is pretty strong. Not strong enough though. Everyone above could stomp him comfortably, in my opinion. His level of power isn't common place in his world, unlike the folks above.
Yusuke: While his true power was never really shown in detail, his aura alone was capable of changing the weather. He final Spirit Gun carved a pretty deep and long scar into the ground and this wasn't even said to be his full capabilities, his father hinting that he still had ways to go. I'd put him above Naruto, but I don't think I have enough to go on to argue his case. If I think of something, I'll gladly do it.
Clare: Atomized her final opponent with her sword using nothing but physical strength. I'm not really sure where to rank that, but it has to be worth something right?
Meliodas: New kid on the block, but he's shown some pretty good stuff. He's kinda hard to pinpoint since everyone in the series seems to be holding or held back for some reason or another. His recent power up doesn't help matters much. Before his power up, I'd say he and Luffy would be a bit equal. Maybe he'd be a bit stronger than Luffy.
Monkey D. Luffy: He's in an interesting place. Basically,I think he's too "grounded" to go up against the people above him currently.
Gon: Strong as crap, but his normal form isn't on the level just yet.
Tsunayoshi: Aside from his final FTL reaction feat in his last fight, he's pretty fragile. Gon would do him in.
Natsu: I've lost respect for Natsu a long time ago. Haven't really kept track of his progress, so I feel he'd get beat by the folks above.
Deku: All for One has a lot of potential, but Deku's not a point where he is a threat yet.
Madaka: Probably not really fair since EOS in her universe ended with everyone growing up and losing their powers. Pre Adult Madoka though? She destroyed the moon, so she'd probably be up their with Naruto, maybe.
Nagisa: As Jorgon Von Strangle would say, he's just a "Puny Little Human Boy". At least, compared to the folks on the list.
Saitama: He has no planet destroying feats, but the implication is there. No proof, no rank though.
Adult Gon: He didn't show enough to really do anything, but it's implied he could go up against Merum, which is pretty impressive.
I've a pretty bad memory, so if I'm forgetting some feats certain characters have shown, please let me know.
Edited by Charnsuka, 12 September 2015 - 08:48 PM.