Angel wasn't in this game. Oleg of course makes a brief appearance before dying along with the Earth, and Zimos gets the odd mention here and there, but Angel appears to have practically been erased from the entire canon.
Not exactly a big loss, though, considering he's easily the most boring member of the Saints. Still, it's undeniably weird considering how pretty much every other character across the series gets some sort of mention if not a cameo. Maybe one of the other voices makes a reference to him, though. But there was certainly no mention to my recollection as the Robin Atkin Downes boss. I guess Hulk Hogan just wasn't interested in reprising the role?
Also, unrelated, but I thought it was touching to see Michael Clarke Duncan get a mention in the cast credits, along with a short snippet of him singing.