Let's change alistar (here me out)
A healthier version of the same champion.
Passive: Whenever alistar attacks an enemy they are knocked back a tiny distance. ( Basically making alistar a wall if he's attacking you. Great for protecting the adc)
Q: same
W: charge. Alistar charges in a direction (skillshot) enemies hit will be knocked aside a small distance rather than back.
E: triumph roar: alistar roars granting attack damage to nearby allies and Increasing their health regen for 10 seconds
R: bull in a China shop: alistar gains damage reduction. He also gains movement speed and attack damage based on his missing health.