Well, as for being nice...
"What few Nagas remained" were taken by the Goliath Scorpions.
Cluster breakdown:
Cuirassiers: 6 (paper total: 252 mechs, 660 elementals, 132 fighters)
Grenadiers: 1 (paper total: 37 mechs, 170 elementals, 2 fighters)
Hussars: 2 (paper total: 84 mechs, 120 elementals, 84 fighters)
Dragoons: 1 (37 mechs, 110 elementals, 32 fighters)
Uhlans: 1 (42 mechs, 60 elementals, 42 fighters)
Cateran: 1 (27 mechs, 135 elementals, 22 fighters, 20 Kirghiz C)
Seeker: 3 (Composition unknown)
Guards: 3 (Composition unknown)
List of known units per 3085 with notes from FMWC/FMU
Alpha Galaxy
24th Scorpion Cuirassiers
Largely heavy 'Mechs, good combined arms
14th Scorpion Hussars
Recon and deep-strike, likely many light mechs. Commander in Fire Moth.
35th Scorpion Cuirassiers
Nothing special of note
Beta Galaxy
1st Cateran Cluster
Only special Forces unit
3rd Scorpion Cuirassiers
From Gamma Galaxy, formerly defending the Temple grounds
5th Scorpion Cuirassiers
From Rho Galaxy, made up of assault 'mechs and heavy ASFs
Tau Galaxy
Made of light to medium mechs and ASFs for covering large areas
2nd Scorpion Hussars
Nothing special of note
4th Scorpion Cuirassiers
Nothing special of note
4th Scorpion Uhlans
filled with light machines
Mu Galaxy
11th Scorpion Dragoons
Second-line/dezgra/sohalama unit
12th Scorpion Cuirassiers
Nothing special of note
33rd Scorpion Grenadiers
Nothing special of note
Chi Galaxy:
1st Scorpion Seekers
2nd Scorpion Seekers
3rd Scorpion Seekers
Omega Galaxy:
1st Imperio Guards
2nd Imperio Guards
3rd Imperio Guards
Some of Ice Hellion's Theta galaxy survived, as did three trinaries from the 200th Attack Cluster. Theta Galaxy had three clusters, the 180th (evenly numbered Mechs, ASFs, and Elementals in binary format) and 43rd and 44th Hector Cavaliers. There's no info on the Cavaliers makeup beyond their entry in FMU; about 70% clan tech and the rest Star League while the 180th is a bit more Clan tech and has a few omnis. Very likely those were integrated into Tau Galaxy; there weren't many survivors. WOR posits 53 warriors total for the Hellions that made the vote.