Looking up his random effects, two of his really common effects on skill 3 are Blind everyone and Poison everyone.
Yes, that includes your team. At least when Barowa/Ramenman don't get RNGesus's blessing they don't hurt your own team.
ANYWAYS, 22 rolls in, bunch of SRs:

Lucius, 5* dark character, pure attacker with a side of blind. One of these days I'll hit Celeste, because I need her drops for GW character anyways.

The original MANLY FISHERMAN, 5* earth pure attacker with a side of counter. Not quite what my earth setup needed (needs another cover or Cagliostro) but he's pretty much a SSR on damage once I get that 5th star.

WATER CHARACTERS WHAT IS THIS? Egerie has a team DA buff like Toot, but trades in break lock for regen. Also gave a SR Harp, which will help when I start on getting Superstar.

WHAT IS THIS AGAIN? Miraoru has spammable debuffs, a couple of turns of 100% DA, and almost 7k base attack at level 70 after the crossfate with...

Zariryao, who was actually the character I pulled from the free 10-roll. Has 3x counter and increased aggro passive while counter is up.
Now I just have to get some daggers from Levi and I could potentially run a water team of Rin/Egerie/one of Miraoru or Catalina/Zariryao, with event Rowain potentially replacing Zariryao if he's any good.
(granted, if I get any magnafest luck my Earth team's going to hit the "throw it at anything" point soon enough)