So Sypha doesn't have a sword BUT I see Louis has fire magic and she's pretty decked out in that respect, maybe they could fight during Sanguis times? I know mostly nothing about Code Vein but I do love the unabashedly edgy opening song so I've got that going for me haha

Also she's a big nerd and knows a bunch of shit, so they could also be study buddies! She definitely needs to collect more conflicted vampires