Verified answer

Ichigo is only bad when his hollow form gains control. He's the all white one. Other than that, whenever Ichigo has a hollow mask he's just himself but with a lot more power.

For the most part, Ichigo has an evil or somewhat bad personality, thus named Hollow Ichigo. Ichigo is able to control his hollow form because he is the 'king'. Hollow Ichigo is the sword, Zanketsu.

What do you mean good or bad. Here I will spoil this, the Viziards want Ichigo to join them. He does only to beat the black/white ichigo which is his hollow for in an internal battle. Ichigo trains with them for a bit, then leaves since Arrancars attack, again!

For your information, if Ichigo get controlled by the hollow within him, he will become bad one, for example, the scene where he fought Kuchiki Byakuya; and later in the series, when he controlled over the hollow's power, the scene where he fought another vizard, he became the good one.