Bill Stewart (ビル・スチュワート), occasionally referred as Bill Martin is a semi-recurring character in Hajime no Ippo.
He is a world renowned trainer that has trained up to seven world champions (including Ricardo.) He believes the perfect boxer is a combination or fusion of science and violence. He mentioned during Date Eiji VS. Ricardo Martinez II, that he felt elegance and technique aren't enough to claim the world, and that there are times when savageness to coat the ring in blood is required.
His first appearance in the story is for the rematch between Ricardo Martinez vs Date Eiji II, when they came to Japan. Prior to the match, Martinez sparred with Ippo. Bill thinks Ippo is a thrilling opponent, and is surprised when he see Ippo start the Dempsey Roll.
Martinez ends the spar early (after noticing Ippo was unconscious), and Bill explained that Ricardo had no intention of destroying the pride of the Japanese champion. He simply wanted to warm-up his left, and any more than that would be pointless.
After the spar, Martinez mention he was surprised someone in this "backwater nation" was capable of using the Dempsey Roll. Bill was surprised too, and commented that Ippo had a good amount of power. Martin adds to Martinez, "For just a second, you felt a chill down your spine, didn't you" but apologizes for the stupid question, since he believes no matter who Martinez fights or what they use, Martinez has no reason to feel agitated.
Prior to the match, Bill tells Martinez he won't give him a strategy. "Simply destroy him with technique and experience." All he asks Martinez is to show the people of Japan the true magnificence of boxing.
After the first round, Bill noticed that Date has levelled up quite a bit since last time. He wanted Martinez to show Date that the gap between them hasn't changed at all over the 7 years, and prove it to him in the 2nd Round. During the Round, Bill notes that, "Anything we've seen once won't be of any use again. This is the world stage."
After the 2nd Round, Bill is surprised Date was able to take Martinez's best shot and keep on fighting. He mentions that Date probably quite a bit of experience against fighters with very strong punches. It's because Date's tasted it before that he can take it now. It was those fierce battles that brought him this far.
Martinez admits that he took Date lightly, but seeing him reminds Martinez that he's become used to this "World Stage". But after awhile, he lost interest in living only to protect the belt, where he got tired of it. Perhaps it wouldn't be bad to return to how he once was. During the 3rd Round, Bill think Date made one mistake when he forced Martinez to recognize him as a formidable opponent and take up his old style.
After the 8th Round, Martinez asks how many punches he has landed on Date. Bill didn't count, and getting an accurate number would be hard. Martinez is surprised that Date is still standing despite sending that many punches. Bill tells Martinez to have confidence in his punches, where he think Date probably reached his limits, but he does feel that Date has miraculous toughness that he has something that hold him up past his physical limits like the dream to become World Champion or maybe revenge against Martinez. Martinez disagrees with him since countless men have come at him in the past with those reason but still fallen by his hands.
After Martinez blocked Date's Heartbreak Shot and Date breaking his fist, Bill wonders if Date still plans to fight. He mention from the perspective of a second to allow him to continue is foolish. Any more than this is meaningless.
Martinez disagrees, he mention that "This is boxing, and there's no way to know what may happen next. As long as a man stays standing, there's the possibility of a miracle. my job is to lower that possibility to zero..."
During the next Round, Bill wanted Martinez to finish it, but Martinez backed off and Date throws the Heart Break Shot again, and it lands. But since Date's fist is broken, it didn't have the power behind it. Martinez finishes Date off and wins the match
In Round 1014, Alfredo calls Martinez to get him to reconsidered a 2nd Rematch between them. He mentions if he beats Makunouchi Ippo, he wants Martinez to accept his challenge. Except, Martinez doesn't remember who Ippo was.
Alfredo mentions that he heard that Martinez sparred with him (in Round 327 when he fought Date Eiji. However, Martinez mentions that he has sparred with countless men, where his opponents maybe one thing, but he can't remember every single person he has sparred with, where he doesn't remember Ippo's name.
After the call, Bill mentions to Martinez that Ippo used the Dempsey Roll, where Martinez finally remembers who Ippo was.
Using Sendō Takeshi previous 4 matches against Mexican boxers, Bill had Jose Nargo use the "Hit and Run" tactic. He notes that Sendō's power is fearsome, but like a "Saber Tooth Tiger", it only scary if it is able to hit. He remarks the reason why his kind died out was because it was too slow to catch it's prey. Sendō is the same.
Bill has the appearance of a middle-aged man. The hair, and his appearance is simple, but mostly Bill appears with his glasses in Ricardo's matches so far, and later in Ricardo's mansion with the same appearance too. Until now he did not appear without them.
Bill is somewhat of a cocky and intelligent trainer, just judging by the fact that when Ricardo was going up against Date he wasn't worried much. However when Ricardo hesitated to finish Date due to the fact that an unfortunate accident could occur, he demanded that Ricardo finished him. During the Jose Nargo vs Sendō Takeshi match, Ippo comments that Bill is known for being a great tactician.
- His surname was originally Bill Stewart in the anime and manga, but was changed to Bill Martin in Round 1122 for unknown reasons, unless it is his middle name rather than his surname.
- It was then changed again to Bill Stewart in Round 1275.
- Bill Martin appear to speak at least 3 languages - English, Spanish, and Japanese.