Can’t say really, but I believe it’ll come down to the characters below.
If you’re using point X-23 and want high tiers characters picking up after her mess, it’s a combination of these characters: Doom, Vergil, Magneto, Sentinel, Ammy and Dante.
Teams
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X-23/Vergil/Magneto, or X-23/Magneto/Vergil. Access to TAC infinites (regardless of what position Magneto’s in since Rapid Slash will allow X-23 to TAC past Vergil), relauncher (but doesn’t extend lengthier combos), Vergil is Vergil nothing more to be said really. Safe DHCs, TOD potential thanks to Spiral Swords which also doubles up as way for Vergil to bypass things, strong projectile assist for both characters. (Disruptor). Mix and match positions (X-23 in 2nd or even 3rd if you want X-23 to play a supporting role and just sit in the back feeding on TAC infinites and extending Vergil’s combos. Shockwave might get X-23 in safely if you quickly DHC from it into Weapon X Prime.
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X-23/Doom/Dante. The basics of what X-23 needs; a strong AA assist that locks down, a strong projectile assist and strong TAC options/infinites. THC options are pretty good. If Hidden Missiles is your thing, you can pick that too, though I don’t think X-23’s the absolute best character to use it with. But that’s just me.
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X-23/Doom/Ammy. Similar to the team above, but with no AAing assist. Strong THC options. Cold Star can be used as a relauncher on characters, but some are more finicky than others.
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X-23/Sent/Dante. Again, the basics of what X-23 needs, except Drones pins people down but suffers from counter-projectiles. Sent offers safe DHCs (I think) and Hard Drive provides escapes from incoming set ups. TAC infinites with Sent.
And it pretty much goes on. If you’re a fan of Magneto with Drones, you can fit X-23 in there somewhere as well. I think you’re bound to get top 5 X-23 teams out of some of those combinations.
If you want specific areas strengthened/want to counter specific opponents , but don’t mind using lower tier characters, then add Strange, Akuma, Ironman, Taskmaster, Storm and RR. Strange allows X-23 to score TOD damage off air throws as well as regular combos, I believe. Merkyl had a video about it on his page and he was hitting massive damage, can’t remember the details. Strange has two good enough assists as well (EoA for extension and some pinning, Bolts for a projectile assist). Ironman’s projectile assist is very good and has a TAC infinite too. Storm has a TAC infinite (but I dunno about the practicality of it) and her DHC is excellent. Not a very good selection of assists unfortunately, pair her up with someone who’s got better assist options, but you can at least use Whirlwind as an projectile assist somewhat, as well as a ghetto extender.
Akuma is a serviceable anchor. Tatsu is quick, making it great for throw option selects (very handy at the beginning of matches) and left-rights and X-23 can convert hits from it well.
Morrigan has some potential with her TAC infinites (which are supposedly easy, no idea) and you can toss in whatever assist you like, but I don’t know enough about Morrigan. You could even do Morrigan/Doom (Hidden Missiles)/X-23(Ankle Slice or Crescent Scythe for crossover counters if you wanna get X-23 in with an assist at some point).
And it goes on. I think a good amount of these combinations will make the top 5 X-23 teams and at the very least, they could be popular teams in the future.