Important Notes!
First, since I’ve been alerted that some Muns don’t wanna interact with minors: Mun is an adult. However, I don’t do NSFW RP on tumblr.
Second: There are actually two versions of McKraken here.
Tensei McKraken and Canon McKraken's timelines deviate some time after the events of YW3. This means that Tensei McKraken has no knowledge of the events of YW4.
The least you need to know about Tensei is that Youmakai suffered for a while under what was basically a world-wide Death Game. McKraken survived the worst of it, but died due to pissing off Rinne.
Rinne immediately brought him back as a kid mostly to embarrass him. Dame is in the same boat, but not for the same reason. She was killed early on, and Rinne accidentally brought her back like that shortly after McKraken. Both continue to run their restaurants.