In A's, most of the characters from the prequel remain, with the addition of several others, mainly Hayate Yagami.
Nanoha, Fate, Vita and Signum serve as part of the Forward Unit of Mobile Section 6 (callsigns Stars 1, Lightning 1, Stars 2, and Lightning 2 respectively) but are not listed to prevent repeat entries.
Hayate is the commander of Mobile Section 6 and its administrative section called "Long Arch", but is not listed here to prevent repeat entries. The same applies to Shamal and Zafira, who are members of Long Arch.
These are people who are seen with Lutecia and assist her.
The Numbers (ナンバーズ Nanbāzu) are Jail Scaglietti's personal task force, they are all "combat cyborgs" (戦闘機人 Sentoukijin), humans that acquired special abilities by implanting mechanical elements into their bodies. As their group name suggests, their specific names are all based on Italian numbers one through twelve. It Is important to note, that each unit received its number based on when its construction started, and not when it was completed.