Doomguy and Isabelle - Big Fishin Gun

I like this trend of Doomguy training cutesy characters. I hope it continues.

It fits into Doom Slayers personality. He loves cute innocent things, he had a pet bunny after all. In the new Quake game it says he keeps Daisy's foot with him, not for good luck, but to "remember innocence lost."

So him training cute innocent things to defend themselves form evil makes sense.