In The Unicode Standard, Cherokee syllabary implementation is discussed in  Chapter 20 Americas.

The Cherokee syllabary was first encoded in The Unicode Standard version 3.0. In Unicode 8.0 casing was added to the script. The script is now encoded in the following blocks:

BlocksCharacter RangeAdded in Unicode VersionUnicode Chart
Cherokee syllabary 13A0..13FF 3.0  U13A0
Cherokee Supplement AB70..ABBF 8.0  UAB70

Subsequent to version 3.0, the following characters have been added to the script:

CharactersUnicode VersionDocumentation
13F5 8.0  WG2 N4487,  L2/13-190,  WG2 N4537,  L2/14-064
13F8..13FD 8.0  WG2 N4537,  L2/14-064
AB70..ABBF 8.0  WG2 N4537,  L2/14-064

A number of proposals for its inclusion were submitted to the Unicode Technical Committee and WG2:

1992-10-29 Cherokee Syllabary — Rick McGowan ( Unicode Technical Report #3 R2)

1995-03-14 Proposal for encoding the Cherokee script — Michael Everson ( WG2 N1172 (Unofficial HTML version of a document submitted to WG2))

2013-10-24 Proposal for the addition of Cherokee characters to the UCS — Michael Everson, Durbin Feeling ( WG2 N4487,  L2/13-190)

2014-02-25 Revised proposal for the addition of Cherokee characters to the UCS — Michael Everson, Durbin Feeling ( WG2 N4537,  L2/14-064)

2014-07-31 Cherokee casing decision may break identifier syntax — Ken Whistler ( L2/14-187)

2015-07-30 Phoreus Cherokee (type specimen sheet) — Ken Lunde ( L2/15-214)