>>114479035Tier list in order.
Ben - Has all the superpowers and can counter Danny's ghost powers with Ghost-like and Mind Altering Aliens
Danny - Can turn spectral, it negates pretty much all physical attacks which makes up the entire arsenal of the following fighters.
Jenny - Has their gadget capabilities maxed out and is a robot, not bound by normal factors like the need to breath or the ability to feel pain. Has canonically been possessed however.
Jake - Has dragon powers. Dragon form pretty much gives him a lit of run of the mill strength powers along with fire breath. This is outclassed by Jenny however as she's been able to not melt under the friction of orbital reentry and has her own flamethrower weapons.
Kim - Has gadgets, has teen power, but is a human and has no special qualities other than what can be provided by a few gadgets. Completely outclassed in this regard by Jenny, and completely outclassed in physical traits by Jake's dragon form.