So I know it's been a while since I've posted, but I just wanted to ask a question~
How many people here have seen or read Eyeshield 21?
And out of those of you, who else agrees Sena and Suzuna would be such a cute couple together~?^^
While it's not 100% canon between them, it's pretty darn close to being Canon.^^

Firstly though
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SPOILER ALERT! SPOILER ALERT! MAY HAVE SPOILERS IF YOU AREN'T AT OR NEAR THE END OF THE ANIME/MANGA! YOU HAVE BEEN WARNED! DON'T BLAME ME IF IT SPOILS ANYTHING FOR YOU!!
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Random Facts backing it (Source sadly Wikipedia, though they'd be easy to confirm if you want):

1: The first time Sena and Monta (and Yukimistu in the anime) saw her in her cheerleading outfit, they were shocked as if they had just seen a ghost (here she teases Sena about liking her).

2: She had a habit of making nicknames for people that she thinks makes them cuter. She called Hiruma "You-nii" (much to the shock of the other members, although Hiruma doesn't seem to mind as much), Jumonji as "Monjii", Kuroki as "Kurokki", Toganou as "Toga", Komusubi as "Komusubicchi" (this was also used by Mizumachi), Yukimitsu as "Yukki" (though he was her senior, although not from the same school), Tetsuo Ishimaru as "Tet-chan", Gen "Musashi" Takekura as "Musha-syan", Mamori as "Mamo-nee" (though Riku calls her this as well), Shien "Kid" Mushakonoji as "Kiddon", Cerberus as "Ceru", both Doburoku-sensei and Pig-Berus as "Burokki" (Much to Doburoku's chagrin). In fact, the only person that Suzuna doesn't make a nickname for is Sena, which might actually imply that she thinks Sena's name is fine as it is, and doesn't need a nickname to know that she acknowledges him.

3: In several scenes, it has been implied that she has feelings toward Sena, though this has not yet been confirmed. It may also be interpreted that likewise, Sena may have feelings for Suzuna, based on his protective actions towards her. Examples include numerous instances when Suzuna leaps from high places and Sena purposely places himself beneath her to cushion her fall, perhaps by the own Sena's nature to help to anyone, although both of them claim to have tried to avoid each other at the same time and by the same way, so ending with a collision.

4: Secondly, when Sena agreed to help Suzuna's brother for her Suzuna blushed.

5: Also, when Mizumachi attempts to peek into the girls' side of the bath house, Sena tries to stop him after hearing that Suzuna is there as well (manga only).

6: And when Sena finally reveals his identity in the game against the Bando Spiders, Suzuna gives a squeal of overjoyed excitement and declares that she was "waiting for this", and immediately begins to cheer him on using his name.

7: After being exhausted in the game against the Spiders, Sena collapsed in Suzuna's arms(he was walking almost asleep and thinking about the game, so he did not notice if someone was in front of him); although she was initially embarrassed she supported him.

8: Additionally, in chapter 241, Suzuna reacts to the possibility of Sena dating the Dinosaurs' team manager with worry, though Mamori thinks that it is because Suzuna thinks of Sena like a little brother. In response, Suzuna says that her feelings are different since the time she met him, but she does not elaborate on this.

9: Also in the 7th ending of Eyeshield 21 (EP 127+) it show's Suzuna holding up Sena's shirt to dry and the ending also shows the silhouette of Sena and Suzuna holding hands.

10: In chapter 275, Suzuna was wearing a dress, and wanted Sena to say that she looked beautiful. Sena did think so, but he was too shy to say it outright (he was actually also really surprised).

11: During the flight to New York, America for the World Cup, Suzuna was seen seated next to Sena in the airplane.

12: When Sena and Suzuna are in the trunk of the car listening in on Agon, Hiruma and Kid's conversation when Hiruma says he will do anything to get the NFL contract Suzuna has a loving/caring look in her eyes when she sees Sena's spirit concerning the subject.

13: At the end of the anime, Suzuna and Sena are seen shopping together, while being spied on by Mamori, Monta, and Togano.

14: Also at the end of the anime, while Sena plays for the NFL, Suzuna is a cheerleader for his team (this is not certain, as she was also seen in the stands, though still cheering).

Isn't 5, 7, and 9-13 just adorable? Heh. I hope these two do end up a 100% canon pairing.^^

Also, here's a cute video link for all the SenaxSuzuna fans:

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[link]
(This video also shows another moment which supports it at the end. When Sena gets hurt she cries out his name, tears in her eyes)