Because characters like Johnny who have Toon Force tend to vary in tiers.
Before I start mentioning what Johnny can do, I need to clarify that a decent portion of Johnny's hax require preparation prior to the battle.
Johnny might actually have the perfect counter to Junko's Madness Manipulation. Johnny's
Empathic Manipulation with 'The Irresistible Making Machine' heightens the users most attractive DNA traits to make them irresistible. When used in higher dosages,
people who are normally mean to him will act nice to him,
and are more than willing to do anything for him. He's irresistible to the
point of obsession,
which causes the town to chase after him and even sell merch of him across the city. While Johnny uses it here for normally mundane things, Junko will still be virtually under Johnny's control, and she'd be more than willing to do anything she wants him to do, so the chances of Junko's Madness Manipulation coming into play here are pretty low unless someone has a good refute.
I think the same applies to Mahito here, as he'd be unwilling to use Soul Manipulation on Johnny via his Empathic Manipulation.
Johnny can basically do anything he wants to either Mahito or Junko while they're in his control, such as Possession, Sleep Manipulation, Morality Manipulation, and most importantly his Matter Manipulation via The Maginator, which gives Johnny "magical powers", which allows him to
transport people to different places,
make people,
and objects disappear,
turn people into animals,
teleport himself and others, and much more.
Unless someone has a good refute to these arguments, I think Johnny can beat Junko and Mahito.
Tbh I'm gonna sound a bit like a broken record here, but would Garou and Chicken be willing to do anything to Johnny via Empathic Manipulation? Can the Chicken use the Nuclear Bomb at any given time?
Andy's going to be difficult, because even if Johnny can do whatever he wants with Andy, because he has no way of hurting Andy permanently thanks to his Low-Godly, and he can't use his Matter Manipulation to make him disappear, so his only option I can see where he can win definitively is via BFR (he can use his Matter Manipulation to
transport Andy to a different place), which, by SBA standards, should give him the win.
Victory Conditions: Death of the opponent,
removing the opponent from the battlefield for at least one week (
BFR), knocking the opponent out for at least one hour, or incapacitating the opponent by putting him in a state in which he can not harm the other fighter(s) for over a day.