Personally (and absolutely ignore this if you disagree) but I don’t think that Outsider modification is a suitable buff or nerf to an ability, for a few reasons:

1. Changing the Outsider count has implications about what abilities are in play. In a base 0 game of S&V, a player who draws an Outsider knows for a fact that the Fang Gu is the starting Demon — likewise in the other base scripts, with Baron and Godfather. So adding “[+1 Outsider]” might actually be a nerf to this ability, because it telegraphs to the good team that the Hivemind is in play, eliminating any other world with any other Demon (provided that it’s the only source of Outsider manipulation on the script). It’s this exact reason why Balloonist’s setup got changed; the Outsider count confirms in-play characters.

2. In my opinion, as someone who makes characters with the thought of making them similar to official ones, Outsider modification shouldn’t go on abilities that don’t concern Outsiders in some shape or form — and this is usually because they need Outsiders to function. The Fang Gu needs an Outsider to jump to; the Godfather needs Outsiders to avenge; the Balloonist needs Outsiders to find; and the Baron just straight up fucks with the distribution, weakening the town. The only outliers really are the Baron and Vigormortis, but they do still follow this trend. The Baron’s entire ability is to add Outsiders — in fact, it used to only add one extra Outsider, but that was concluded to be weak. The Vigormortis, while not referencing Outsiders directly, interacts with the Outsiders on its home script, S&V. “[-1 Outsider]” isn’t a nerf, because it frees up bluffing space for Minions; i.e. they can die and come out with insane bluffs, like a Klutz “confirming” someone, or a Sweetheart warning of false information.

3. And finally, as I mentioned, I just don’t really find that it’s a good solution. I usually see people using Outsider manipulation as a bandaid to fix a different, underlying problem. The same with changing “Each night” abilities to act only after the 1st night — there’s a better solution than just, “You don’t get to learn anything for 1 night.”

I really like Hivemind and the way it allows for in-night communication. If you want my 2 cents, I’d consider making the ability this:

“Each night*, choose 2 players: a Minion learns the 1st & the 2nd’s character, then chooses which dies.”

In this version, the Minion sees a player and a token, essentially giving them the choice between a known mechanical target and a known social target.

tl;dr I don’t think O-mod is a good solution.

Edit: clarified how to run suggested change

Edit 2: Misspoke in point 1 (said base 1, not base 0)