I feel like only being able to change stamina regen and max health is pretty limited, so heres my idea. Using sliders, you can change attributes of every player. Starting with
Attack Related (all are affected by Weight)
Light Punch Damage - Changes damage from light punches
(50%-500%)
Heavy Punch Damage - Changes damage from heavy punches
(25% - 750%)
Dropkick Distance - Changes how far your dropkick goes. (independent on dropkick damage)
(50 - 200%)
Dropkick damage - Changes dropkick damage.
(10% - 350%)
Headbutt Damage (25% - 550%)
Global Attack Damage - Increases damage from all attacks. (1x-1.5x-2x)
Weapon Damage (50%-200%)
Knockback (25-250%)
Defense Related
Knockout Resistance - Sets your chance to be knocked out by attacks. (10% - 100%)
Knockback Chance - Changes how likely you are to get pushed back by attacks (5%-100%) (affected by Weight)
Freeze Speed - Changes how fast you freeze. (30% - 200%)
Other Attributes
Throw Strength - Changes how far you throw stuff.
(50% - 1000%)
Climb Speed - Changes how far up each climb brings you. (affected by Weight)
(25%-400%)
Weight - Makes gravity affect your character differently, and other niche attributes like how fast you lose stamina in water and how much stamina opponents use when holding you. (1% - 500%)
Attributes can be changed for everyone or on a specific player (shown by a small bar graph symbol on a button) Modifying a specific players stats causes their symbol to appear red and reduces animal level gained for each player