Quick question is bam an irregular. Because I vaguely remember in the first season bam wa...

yeah, he is a irregular. that's the whole reason why he's an slayer candidate, only irregulars have the power to kill Jahad.

But he was chosen by the tower so he's not. Rachel is the irregular one.

I am confused

Not really sure which chapter but there's a flashback showing how rachel got into the tower. The tower was supposed to pick bam but rachel sort of got into the way, headon (the rabbit guard in the beginning) rejects her knowing that she was not choosen by the tower. Rachel thought that bam stole everything that meant to be hers... So she's irregular.... I hope that would help you though im not that good at explaining in english...

So if bam is not an irregular how will he kill jahad

bam is an irregular who was chosen by the tower and rachel was never chosen by the tower but she cheated her way in so shes neither a regular nor an irregular just a BIATCH (just my opinion)

when the light came to take bam it took rachel instead

Actually, i don't think baam's ability to kill jahad is because he's an irregular. if it were like that, i'm sure Enryu could have easily just heeded Arlene's request and killed jahad. I think it's rather- Baam was given the ability to override life and death and can kill anything regardless of whether it's immortal due to a spell, a contract, or just it being a species trait. I'm certain that arlene had blessed him with that power which is why he was forced into being a slayer. It would also explain how he killed the immortals on the floor.

Poor Rachel thinks it's a thorn thing... in reality it's probably "I fucking died and was granted this ability" kinda thing... Rachel, sweety if you want that power go die~
(▰˘◡˘▰)