These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
The end of the first comic has a random side plot with Warrior coming to the aid of a woman attempting suicide after being pelted with rocks and called a "half breed". Before that, you also had some guy who comes out of nowhere and says "Believe this"; he is never mentioned again.
Also of note: absolutely everything else that happens.
The "Believe this" guy appears again in issue #4 (the one in black and white), when Warrior looks in a mirror in the real world. He's implied to be possessing Warrior's body (picking fights with everyone, killing world leaders, etc.) while Warrior's spirit is in the Terrain of Testament.
Ho Yay: Brendan and Frank which was lampshaded by the former's wife, Tess.
Tess: (Giving the phone to her husband after speaking to Frank) It's your boyfriend.
The Woobie: All three of the main characters. Where to begin?
Brendan resents his father for treating him like The Unfavorite because he wasn't as talented at fighting as Tommy.
Paddy himself later becomes The Woobie. Tommy, his long-lost son, appears but wants nothing to do with him other than training to fight in the tournament. His other son, Brendan, resents him for treating him like The Unfavourite and will not let Paddy see his grandchildren. When Paddy drives to Brendan's house, Brendan gets upset at his coming, telling him that he's restricted to phone calls and mail, and then slams the door shut when Paddy tries to see his family. Tommy later fights with Paddy and induces him to relapse into alcoholism, leading to his panicky hotel scene.
Jerkass Woobie: Tommy was favored by his abusive, alcoholic father only because of his fighting talent. When he and his mother escaped the household, his brother didn't go with him, which he views as abandonment. His mother later dies, with only Tommy there to help her through her illness, and receives no support afterwards. He joins the Marines and is with his best friend until said best friend dies in a friendly fire attack. He joins the tournament to support the widow of his best friend, only to be alone in the ring in the fight against his brother, whereas Brendan has his wife and trainer with him. All this is with the knowledge that he will be forced into military court once the fight is over. However, he eventually reconciles with his brotherand cries in his arms at the end of the fight.