A 'Together in Spire' Multiplayer collection/modpack focusing on adding a bunch of extra modded characters that have compatibility with the gamemode, either by acknowledgement of the TiS team or a character's own creator(s)!
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I've thrown in a bunch of QoL mods to make sure things go a bit smoother too. As a bonus, the order of mods in this collection from top to bottom is also the load order I use when playing with this modpack, so feel free to copy it!
Feel free to mix-and-match, add and remove mods as you see fit; you might not like the Dark Mode map, for example.

The philosophy behind this collection is to add as many characters as possible that AREN'T from existing properties but which DO fit the original artstyle, while ensuring a high level of compatibility (i.e. some modded character mechanics don't work well in multiplayer); this may explain why one character or another you are looking for isn't here. Of course, you are welcome to use this collection as a base and then manually add any other characters to it yourself, though!
That being said, if you have any feedback or issues, such as mods you think need to be added or removed, please let me know! I intend to update this as more mod characters become fully compatible with TiS, and to improve the selection of QoL mods and such; do remember I don't control any of the actual mods themselves, however.

Related to this, I am not affiliated with anyone behind any of these mods, and have put this collection together for the personal use of me and my friends; if other people get some use out of it, that's a welcome bonus.
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I also have another TiS Multiplayer mod collection that instead focuses on compatibility with the official 'Booster Pack' mod, which you can check out!