I said this elsewhere, but Kris didn't have access to his Chapter 4 abilities, so I added more information
First, with Check, Kris can find Deku's weaknesses and form a strategy on how to defeat him.
With Pirouette, Kris can deplete Deku's stamina and tire him out, lower his defense, lower his strength, and since this is not turn-based, Kris can do this constantly with the only disadvantage being the possibility of increasing Deku's strength for one turn, which I believe would only be one attack
With Hypnosis, Kris would only have to give him a strange look, and Deku would get tired and lose strength much faster.
Kris's best strategy would be to keep their distance, attacking with danmaku in Yellow Mode, shooting hearts with
Sharpshoot, and attacking from a distance with their
normal attacks and X-Slash. With
TrapOne can also throw red cages along the way and even trap Deku like small obstacles.
Defensively, Kris can use their shield to protect themself from most attacks, with
Weather Items can summon objects of indefinite quantity to protect their body or soul, and to be extra sure, Kris can increase their speed with HoldBreath and ScaredyCat
Another possibility is that Kris can summon allies if they needs them, such as
Lancer,
who has already helped them on previous occasions. and
Rouxls Kaard would help if Lancer is involved (
And Starwalker)
Since Kris doesn't have access to their optional equipment, they can't summon Spamton or Jevil. I'm not sure if the summoning will be restricted here, but if not, Rouxls Kaard can help with his Rule Card by preventing Deku from attacking, using items, or using magic.
One last funny possibility would be that Kris wins through ACTs and social influence, a pacifist ending