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Daring synthesis after months of observation. Advent has broadly established two "subgroups" which are team "Cute" and team "Cool" (probably more accurately Team かわいい and team かっこいい). Diamond Dogs is Team Cute, and Shioraven is Team Cool. Please ignore that both members of Team Cool are dorks.
Both in terms of actual streams and audience reactions there is definitely a split in these camps, with some crossover between cool and cute as seen during full-gen collabs. However my theory is that if ever allowed (due to rare circumstances) either dog individually could probably form another three-man unit in combination with the existing Shioraven.
The most obvious would be Boobs Trio, which could probably be best classifed as the "Beauty" subgroup for Advent. Moco-chan acts as a limiter normally, but with her occupied elsewhere the Boobs Trio would have some new flavour that would probably work best in a slow-paced gaming environment. Minecraft is most obvious, but board games or "girl's talk" type collabs would also play to the strength of this subgroup.
The less obvious is what I am tentatively calling "Powerpuff Girls", Mococo being the sugar, Nerissa the spice, and Shiori as everything nice. The dynamic here becomes Moco-chan doing her feisty brat routine, Nerissa being flirty or playfully butting heads with Mococo, and Shiori playing mediator and straightman to their antics something competitive rather than cooperative plays to the strengths of this subgroup.
Both of these hypothetical Advent subgroups are probably going to be very rare (if we ever get them at all) and it's going to be mainly Diamond Dogs and Shioraven for 2024 but I think collabs of these subgroups would enable some serious kino.