Wrong board This should be in community.
Anyways, there are no legions that play as the Germanic Allies that I am aware of. Id suggest looking at the legions list to see if you can see any names involving Germania or something alike.
This. There was no "pure" germanic Legion. All "pure" germanic units ever existed were Auxilia units.
But here some Legions garrisoned in both german provinces until the 5th century, but not all at the same time of course (Germania Superior + Germania Inferior):
Ulpia Noviomagus BatavorumLegio VIII Augusta
Legio X Gemina pia fidelis
Legio XXX Ulpia Victrix
Legio IX Hispana
Castra Vetera I + II (Colonia Ulpia Traiana)Legio XVIII Augusta
Legio XVII Augusta
Legio XXI Rapax
Legio V Alaudae
Legio XV Primigenia
Legio XXII Primigenia
Legio VI Victrix
Legio XXX Ulpia Victrix
Castrum NovaesiumLegio XIX
Legio XVII or Legio XVIII
Legio I Germanica
Legio V Alaudae
Legio XX Valeria Victrix
Legio XXI Rapax
Legio XX Valeria Victrix
Cohors III Lusitanorum
Legio XVI Gallica
Legio VI Victrix
Apud Aram Ubiorum (Colonia Claudia Ara Agrippinensium)Legio I Germanica
Legio XX Valeria Victrix
Castra Bonnensia (Bonna)Legio I Germanica
Legio XXI Rapax
Legio I Minervia
MogontiacumLegio XIV Gemina
Legio XVI Gallica
Legio II Augusta
Legio XIII Gemina
Legio XV Primigenia
Legio IV Macedonica
Legio XXII Primigenia
Legio I Adiutrix
Legio XXI Rapax
ArgentorateLegio VIII Augusta
Legio XIV Gemina
Legio XXI Rapax
VindonissaLegio XIII Gemina
Legio XXI Rapax
Legio XI Claudia
Legio VIII Augusta
But now it's yours to sort out which Legions are reserved or not!