DISCLAIMER: I do not own Bleach or Image Comics.

Ichigo sat in class, Rukia next to him. Orihime and Tatsuki looked briefly at him, and Chad sat several seats behind him. Keigo was looking deflated, having just been told by Mizuiro that his girlfriend's little sister was not available to anyone who didn't have a car. Chizeru also looked deflated, having taken a kick to the face and then another kick to the backside from Tatsuki when she had tried to proposition Orihime.

As Ichigo started to daydream, Rukia's pager beeped, sending her a message warning her that hollows were nearby. Ichigo quickly placed Kon's Konpaku into his mouth, leaving his body and letting a delighted Kon take his body. Ichigo ran from the room, nodding to Chad, Uryu, Orihime, Tatsuki, Keigo, Mizuiro and Rukia, the only people in the room who could still see him.

Spawn held up two hollows by their heads, crushing their masks and heads by clenching his fists. Another hollow charged, but Spawn's chains rapidly punched holes through it. The chains then flung a chunk of that hollow's mask at another hollow, smashing its face.
"You losers are wastin' my time."

Ichigo arrived at the place where Rukia's pager had sensed the hollows, but there was only one creature on the street. It looked like a hollow, and yet it didn't. Ichigo couldn't tell what it was. The creature turned to him.
"Hey, you. Get the fuck outta here. This ain't no freak show. Get lost or I'm gonna kick your ass."
Ichigo smirked. "Oh really? Is that so? I should warn you that Soul Reapers don't take orders from hollows. We kill them."
The creature folded its arms.
"Soul Reaper, eh? You must be new, because I already met most of the top Soul Reapers. I like Head Captain Yamamoto and his seconds Shunsui and Ukitake. I think you're just a pain in the ass though. What's your name kid?"
Ichigo readied his sword.
"I'm Ichigo Kurosaki, substitute Soul Reaper."

"Spawn. My friends call me Al, but you can call me Spawn or Your Asskickingness, it's up to you."
Ichigo snarled. He didn't like the way this "Spawn" was so dismissive of him. Spawn treated him like an annoyance. Ichigo charged, swinging Zangetsu at Spawn. To his shock, a chain came from Spawn's chest, blocking the sword. Ichigo dived back and landed on his feet. He then gripped his arm, pointing his sword down.
"Bankai! Tensa Zangetsu."

Spawn watched as Ichigo's sword suddenly shrank to a smaller size, now resembling a normal katana. Spawn responded by summoning a large battle-axe into his hand, ready for battle. Ichigo charged forward, swinging his sword. Spawn noticed a marked increase in Ichigo's speed, but his chains still reacted fast enough to deflect the repeated sword blows. Ichigo jumped back, lifting his sword above his head.
"Getsugatensho!" Ichigo swung his blade down, launching a blue wave at Spawn, which Spawn dodged. Ichigo rapidly hollowfied, a white mask with red markings adorning his face. Ichigo then swung his sword several times, releasing black Getsugatensho's at Spawn. Spawn dodged the attacks, before he charged. Ichigo readied another Getsugatensho, but this time he didn't launch it, merely charging with it on his sword.

Spawn blocked the strike with his axe, before shoving Ichigo back and flinging his axe at Ichigo, watching as Ichigo struck it aside. Spawn then summoned a large claymore and assumed a samurai stance.
"Swords it is."
Ichigo charged, and Spawn blocked Tensa Zangetsu on the blade of his claymore. Both warriors tried to force the other back, before Spawn's chest suddenly erupted with chains which attacked Ichigo, forcing him to jump back. Ichigo glared at Spawn, now realising that he needed more tricks. Ichigo then flash stepped to Spawn, starting when Spawn blocked his sword strike with a two-pronged blade that had suddenly emerged from Spawn's shoulder. Ichigo jumped back in time to avoid Spawn's claymore, before Spawn suddenly charged, swinging his sword at Ichigo. Ichigo blocked the strike, before flash stepping past and slashing Spawn's side.

Ichigo turned, and was horrified to see the wound he had dealt Spawn close back up.
"Instant Regeneration."
Spawn faced Ichigo.
"You know what you're doing, but you gotta change your tactics a tad. I can always tell what you're gonna do next."
Ichigo quickly charged, this time firing a Getsugatensho before preparing another to put on his sword. To his horror, Spawn sidestepped the Getsugatensho and the charge, before his chains suddenly flared to life, striking Ichigo repeatedly. Ichigo recovered and struck the chains away, before Spawn suddenly slammed into him and threw him against a building, shaking the entire structure of the building.

Spawn's chains then wrapped around Ichigo and pulled him forward, holding him up. Ichigo fired a Getsugatensho into Spawn's chest, sending him staggering, but Spawn rapidly pointed his claymore at Ichigo's face.
"I don't feel like killin' you. Just cut this shit out, kid."

Ichigo sighed, and nodded. Spawn instantly dropped him on the ground, and Ichigo landed shakily on his feet. Spawn then turned his back.
"Now get outta here, kid."
Ichigo returned Zangetsu to its sealed form and removed his mask.
"Who are you? What do you want?"
Spawn sighed. "I ain't gonna hurt none of your friends, kid. Soul Reapers have never been my enemy. All I want right now is for you to leave me alone."

Analysis:

Spawn possesses multiple incarnations, and his main incarnation varies vastly in power. Obviously the main incarnation is the one being used, and since it ranges from barely stronger than human to stronger than Ichigo by far, we needed to find some sort of midway, since this is not mere low-end, high-end feats, it is in fact his power changing throughout the series depending on his surroundings.

Toward that, we can conclude that he can be harmed by a Zanpakuto, since heavenly and demonic weapons can kill him if they decapitate him. It's also likely that spirit energy may slightly lower his abilities due to the fact he feeds off negative energy, but Ichigo's hollow side would have plenty of negative energy for Spawn to feed off of, thus balancing that out.

As a result of this, Ichigo hollowfying was actually the worst thing he could have done, and he would have been better off fighting Spawn with only his Bankai. While Ichigo has powerful attacks, Spawn has dodged lasers, allowing him to dodge Getsugatensho, and he has used buildings as weapons, making him stronger physically than Ichigo. Most importantly, Ichigo may be a capable fighter, but he has only a few techniques, and he largely relies on Getsugatensho. Spawn on the other hand can make weapons on the fly and has superior skills in battle, having once been an elite soldier.

In conclusion, Ichigo's only means of winning is via decapitation, and with Spawn being faster and stronger, Ichigo not knowing to decapitate Spawn, and Spawn being able to learn Ichigo's moves very quickly and think up countermeasures for them, as well as having abilities the like of which Ichigo has never faced or even seen, Ichigo is at a disadvantage in almost every regard.