Well if i read correctly! isn't he bringing in a character from Rifts?
Did Rifts have a d20 version?
But besides that no matter where we are or go, he could literally arrive via a rift opening...like the ravenloft mists transport.
And depending on What type of thing from the Rifts game set he is...will be how fitting or out of sync with that world or us...
Think i have told this story of a game we played where a guy joined our group in the morning at a gaming club..we excepted whatever race you wanted to play as we had an extensive group...well he played a wemic (half man,half lion basically) but he joined us as we were returning to town...
The town wall guard took one look at him and peppered him with arrows.
So whilst we have encountered a Lion man,and were a bit twitchy with that first meeting he did survive meeting us..
And we have some other misfits within our midst,so you may be lucky not to get your head blown off on sight. 🙂
Welcome anyhow..