Kayn blue form.
I love kayn's playstyle, and by playstyle jungle clear speed. But I do like I can choose an assasin or a bruiser. The only problem is. Your blue form is utterly useless.
Look at his Red form.
Q does % max life, a fairly high amount, plus a portion of your own AD and heals you.
W does high damage, and it knocks up people.
E, the same thing it is before you have passive, just free healing and stupid escape.
R, LOL YOU THOUGHT YOU GOT ME? NAW FUCK YOOOOOU. Massive cockblock and stupid amount of healing off it.
Now compare that amazing kit to the blue form.
Q, Just does some decent damage, nothing special.
W, can be cast while moving, has more range and does MEH damage.
E, the only better thing, you run through walls like sonic, that's it.
R, resets passive....that's it, low damage and resets a passive.
There is NO reason your team would ever need blue over red, it's honestly just useless and will never serve a good purpose. It's weaker, no utility, might be faster but dies in less than 1 second.
How to fix the entire problem with blue team. Turn blue forms ult into an execute. That's basically it.