Hopefully, this event made the word spread once more toward Camelot and Nintendo. I have honestly low hope for Isaac as the last character - I believe it will be Phoenix Wright - but if we could get a good remake, I would be satisfied.
It certainly and definitely brings attention more easily towards him and Nintendo when someone (him) who works with them makes a post about the series themselves, they are more inclined to check the reactions and comments about it in such situation, rather than random GS comments on posts about different topics entirely.
Been a real minute. I've been addicted to FF14 lately. Heh. Wellll... there are a few avenues this could go not in any particular order of probability:
1, It could be another of those "Sakurai" picks.
2. It could be a third party.
3. It could be a first party.
4. It could be a character that breaks a "pre-established rule" that has yet to be broken.
So far all the characters in this pass have had very specifics reasons behind them getting in.
• Arms was already considered and therefore half assedly compensated in base game, because they always wanted it to be in the game. Basically it was a Nintendo pick in all its fullness. They wanted that IP of theirs to be represented as playable, and 2nd pass happening made it finally possible.
• Minecraft is literally celebrating the most sales successful gaming title.
• Sephiroth was timed to happen in the same year FF7R happened, just like how Hero was timed to happen in the year when DQ11 was once again Square Enix's main focus.
• Kazuya is from the best selling non-smash fighting game series, Tekken, and one of the most known fighting game series that had yet to be playable in the game, and it happened despite Sakurai saying he refused to make it happen because it didn't translate well into smash's gameplay back then. Just like he refused Ridley and then it happened anyway.
• Xenoblade Chronicles 2, another series Sakurai refused adding, in this case with the excuse being "it was too recent" back then in 2018, yet he went back on his words during this same game and brought Pyra and Mythra in. This was a clear example of how Sakurai can go back on his words during the current game, so people saying "better luck next game" ate crow really hard with this. The only excuse given in the end for Rex not getting in, was because he was too much of a hassle with characters going in multiple different directions, but that didn't stop XC2 from being added in the end anyway.
With this in consideration, I don't think they will add a 3rd party without a very specific reason, a big reason at that. That alone should help discarding a lot of 3rd parties that have nothing big going on or aren't a milestone of some sort in gaming history in general. The options really are short when you take this in consideration…
Of course, there is always the chance of it being a curveball, meaning a fan demanded 3rd party for the sake of pleasing fans, which has been indeed the theme of this second DLC pass as Sakurai previously described it would be.
If it's a first party, boi that just makes it even harder to speculate (as usual, because they are the hardest ones to speculate on at all ), but so far :
• Byleth promoted a new entry in the series (just like awakening and fates promoted theirs at their given times).
• Arms was already considered and wanted ( even Sakurai said Springman, who is an AT, was considered as well), and it ended happening since they had time to make some final inclusions with the second pass being greenlit. Min Min was the choice merely because it was chosen by the Arms's developer.
• XC2 was most definitely a fan demand pick, but I could see it also being to "promote" the Torna DLC that released on 2018 I guess.
So taking that in mind, it's either a 1st party that is getting something new recently or soon, or it's a fan demand 1st party (which Isaac would fit the bill, since he is like the biggest if not the second biggest most wanted first party out there yet).
The problem with analyzing 1st party based on getting something new or recently… is that there isn't much to look at recently really, specially considering WHEN the negotiations for the 2nd Pass happened, which was prior to Summer 2019.
Unless they pull a "corrin" (meaning they put a character from a game not yet released or localized), there isn't much going on in terms of 1st parties. So this leaves us with thinking the most flexible and easier thing to pick… a fan demanded 1st party (or something that they intended to be in base game like Arms that we aren't aware of…)
Imo, It's gonna be a fan demanded 1st party. I personally doubt a 3rd party closing this, specially given how base game and pass 1 ended with 1st parties. They've kept all of their big guns for the first half or midway of the passes so that they can push the sales of the "pass" format of the DLC, which is what profits them the most, because otherwise, people just buy individual characters instead, which is what happens when you already know most of the pass already, therefore you shouldn't expect anything BIG to close the DLC pass, just like it's proven by the fact that base game and Pass 1 didn't end big either. It's all a marketing strategy to get the most profit out of the DLC, have the big stuff make the pass format sell the most as possible while you still can.
And when looking at mii costumes, you can really see how they are just killing every fan demanded 3rd party with costumes instead of putting them as playable… so… yeeeeah… I really don't wanna pray for any 3rd party at this point, lol. That's just me tho!