Hellrider

[Younghawk]

With  {Hellrider} effect can u redirect it to a planeswalker?

[scarsabrex]

Yes

[Masterofpuppets]

A planeswalker can be targeted by any ability or spell that targets a player.  You must declare which player or planeswalker you are attacking as attackers are declared.

[Double-O-Scotch]

To elaborate further, the controller of a spell or ability may choose to redirect the damage dealt to a player to a PW that player controls.
Example. You can't {lightning bolt} a planeswalker. You can, however, redirect the damage dealt to a player targeted with said {lightning bolt} to a planeswalker they control.

RESOLVED

[Kaleo42]

To elaborate even further than that, each attacker is a different trigger so you could do some damage to the walker and some to the player with an all out attack.