Also the travel back in time and kill your parents/infant self doesn't work with most of these guys. Dark Schneider has dispel bound which protects his current self from time tampering among other defenses. Thanos as the avatar of Death was immune to death outside of a very powerful reality warper. Giorno's Golden Requiem is just....broken. Nothing you do will work Unless you're beyond universal.. He can reset time and was even immune to abilities that transcended time. Dr. Strange and Doctor Doom are not inherently immune to such tactics, but can time travel themselves. Classic Strange held his own against the Living Tribunal and also knocked out a weakened Galactus just to put that into perspective.
1. Naruto Uzumaki (Naruto Shippuden) - Upper Dragonball level. Perhaps Roshi
2. Ichigo Kurosaki (Bleach) Dangai Ichigo, similar to Naruto. Current Ichigo unknown. Probably early Z. Perhaps Raditz but that's pushing it
3. Monkey D Luffy (One Piece) - upper mid Dragonball. Anyone below Roshi most likely
4. Toriko (Toriko) -lower mid Z. Probably up to Saiyan Saga Vegeta.
5. Yusuke Urameshi (YYH) Any Dragoball character. Maybe low Z such as Raditz.
6. Natsu Dragneel (Fairy tail) Mid Dragonball level. Not above 21st Budokai Krillin.
7. Tsuna (KHR) - Probably most Dragonball characters if not all. Maybe not Piccolo Daimo.
8. Gon Freecss (HxH) - Similar to Natsu. Not above mid Dragonball level.
9. Allen Walker (D gray man)- Same as Gon and Natsu. Could beat some mid level Dragonball characters, but not stronger than 21st Budokai Semi Finalists.
10. Edward Elric (FMA) - Low Dragonball level. No above early characters.