[SOLVED] can someone explain why my knight wont appear when my background does

so I'm importing my battle system code which deals with all the images and code for the battle system into the while loop of the play screen for my menu but for some reason my background appears that's in the same Battle_systems file as the knight but my knight doesn't

this is the menu code that everything is being imported into to

import sys

import pygame 

import Battle_system 
from button import Button

pygame.init()

SCREEN = pygame.display.set_mode((1280, 720))
pygame.display.set_caption("Menu")

BG = pygame.image.load(r"C:\Users\olive\Desktop\Programming project\rpg\Menu\Background1.png")
SURFACE = pygame.image.load(r'C:\Users\olive\Desktop\Programming project\rpg\Menu\surface.png')


def get_font(size):  # Returns Press-Start-2P in the desired size
    return pygame.font.Font(r"C:\Users\olive\Desktop\Programming project\rpg\Menu\font.ttf", size)


def play():
    while True:
        PLAY_MOUSE_POS: object = pygame.mouse.get_pos()

        #draw background
        PLAY_TEXT = get_font(45).render("This is the PLAY screen.", True, "White")
        PLAY_RECT = PLAY_TEXT.get_rect(center=(640, 260))
        SCREEN.blit(SURFACE, PLAY_RECT)
        Battle_system.draw_bg()
        Battle_system.draw_panel() 
        

        #draw characters
        Battle_system.knight.draw
        

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()

        pygame.display.update()

def new_func():
    Battle_system.knight.draw


def options():
    while True:
        OPTIONS_MOUSE_POS = pygame.mouse.get_pos()

        SCREEN.fill("white")

        OPTIONS_TEXT = get_font(45).render("This is the OPTIONS screen.", True, "Black")
        OPTIONS_RECT = OPTIONS_TEXT.get_rect(center=(640, 260))
        SCREEN.blit(OPTIONS_TEXT, OPTIONS_RECT)

        OPTIONS_BACK = Button(image=None, pos=(640, 460),
                              text_input="BACK", font=get_font(75), base_color="Black", hovering_color="Green")

        OPTIONS_BACK.changeColor(OPTIONS_MOUSE_POS)
        OPTIONS_BACK.update(SCREEN)

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()
            if event.type == pygame.MOUSEBUTTONDOWN:
                if OPTIONS_BACK.checkForInput(OPTIONS_MOUSE_POS):
                    main_menu()

        pygame.display.update()


def main_menu():
    while True:
        SCREEN.blit(BG, (0, 0))

        MENU_MOUSE_POS = pygame.mouse.get_pos()

        MENU_TEXT = get_font(100).render("MAIN MENU", True, "#b68f40")
        MENU_RECT = MENU_TEXT.get_rect(center=(640, 100))

        PLAY_BUTTON = Button(
            image=pygame.image.load(r"C:\Users\olive\Desktop\Programming project\rpg\Menu\Play Rect.png"),
            pos=(640, 250),
            text_input="PLAY", font=get_font(75), base_color="#d7fcd4", hovering_color="White")
        OPTIONS_BUTTON = Button(
            image=pygame.image.load(r"C:\Users\olive\Desktop\Programming project\rpg\Menu\Options Rect.png"),
            pos=(640, 400),
            text_input="OPTIONS", font=get_font(75), base_color="#d7fcd4", hovering_color="White")
        QUIT_BUTTON = Button(
            image=pygame.image.load(r"C:\Users\olive\Desktop\Programming project\rpg\Menu\Quit Rect.png"),
            pos=(640, 550),
            text_input="QUIT", font=get_font(75), base_color="#d7fcd4", hovering_color="White")

        SCREEN.blit(MENU_TEXT, MENU_RECT)

        for button in [PLAY_BUTTON, OPTIONS_BUTTON, QUIT_BUTTON]:
            button.changeColor(MENU_MOUSE_POS)
            button.update(SCREEN)

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                sys.exit()
            if event.type == pygame.MOUSEBUTTONDOWN:
                if PLAY_BUTTON.checkForInput(MENU_MOUSE_POS):
                    play()
                if OPTIONS_BUTTON.checkForInput(MENU_MOUSE_POS):
                    options()
                if QUIT_BUTTON.checkForInput(MENU_MOUSE_POS):
                    pygame.quit()
                    sys.exit()

        pygame.display.update()


main_menu()

and this is the battle system code itself

import pygame,sys,random

pygame.init()

SCREEN = pygame.display.set_mode((1280, 720))
pygame.display.set_caption("Battle")


clock = pygame.time.Clock()
fps = 60







#load images
#background image
GBG = pygame.image.load(r'C:\Users\olive\Desktop\Programming project\rpg\setting\Background.png')
#panel image
PNL = pygame.image.load(r'C:\Users\olive\Desktop\Programming project\rpg\setting\panel.png')




#function for drawing background
def draw_bg():
    SCREEN.blit(GBG, (0, 0))


#function for drawing panel
def draw_panel():
    SCREEN.blit(PNL, (0, 500))



#fighter class
class Fighter():
    def __init__(self, x, y, name, max_hp, strength, potions):
        self.name = name
        self.max_hp = max_hp
        self.hp = max_hp
        self.strength = strength
        self.start_potions = potions
        self.potions = potions
        self.alive = True
        img = pygame.image.load(f'rpg/{self.name}/idle/0.png')
        self.image = pygame.transform.scale(img, (img.get_width() * 3, img.get_height() * 3))
        self.rect = self.image.get_rect()
        self.rect.center = (x, y)


    def draw(self):
        SCREEN.blit(self.image, self.rect)


knight = Fighter(200, 260, 'Lothric', 30, 10, 3)
slime1 = Fighter(550, 270, 'Slime', 20, 6, 1)
slime2 = Fighter(700, 270, 'Slime', 20, 6, 1)

slime_list = []
slime_list.append(slime1)
slime_list.append(slime2)

the whole code runs and works without any errors but the knight doesn't show up and I'm a it stuck on the answer