Helvetica Neue font theme for PowerPoint for macOS. Put this in ~/Library/Group Containers/UBF8T346G9.Office/User Content.localized/Themes.localized/Theme Fonts

Helvetica-Neue.xml

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<a:fontScheme name="Helvetica Neue" xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main">
  <a:majorFont>
    <a:latin typeface="Helvetica Neue" />
    <a:ea typeface="" />
    <a:cs typeface="" />
    <a:font script="Jpan" typeface="ＭＳ Ｐゴシック"/>
    <a:font script="Hang" typeface="굴림"/>
    <a:font script="Hans" typeface="黑体"/>
    <a:font script="Hant" typeface="微軟正黑體"/>
    <a:font script="Arab" typeface="Arial"/>
    <a:font script="Hebr" typeface="Arial"/>
    <a:font script="Thai" typeface="Cordia New"/>
    <a:font script="Ethi" typeface="Nyala"/>
    <a:font script="Beng" typeface="Vrinda"/>
    <a:font script="Gujr" typeface="Shruti"/>
    <a:font script="Khmr" typeface="DaunPenh"/>
    <a:font script="Knda" typeface="Tunga"/>
    <a:font script="Guru" typeface="Raavi"/>
    <a:font script="Cans" typeface="Euphemia"/>
    <a:font script="Cher" typeface="Plantagenet Cherokee"/>
    <a:font script="Yiii" typeface="Microsoft Yi Baiti"/>
    <a:font script="Tibt" typeface="Microsoft Himalaya"/>
    <a:font script="Thaa" typeface="MV Boli"/>
    <a:font script="Deva" typeface="Mangal"/>
    <a:font script="Telu" typeface="Gautami"/>
    <a:font script="Taml" typeface="Latha"/>
    <a:font script="Syrc" typeface="Estrangelo Edessa"/>
    <a:font script="Orya" typeface="Kalinga"/>
    <a:font script="Mlym" typeface="Kartika"/>
    <a:font script="Laoo" typeface="DokChampa"/>
    <a:font script="Sinh" typeface="Iskoola Pota"/>
    <a:font script="Mong" typeface="Mongolian Baiti"/>
    <a:font script="Viet" typeface="Arial"/>
    <a:font script="Uigh" typeface="Microsoft Uighur"/>
    <a:font script="Geor" typeface="Sylfaen" />
  </a:majorFont>
  <a:minorFont>
    <a:latin typeface="Helvetica Neue" />
    <a:ea typeface="" />
    <a:cs typeface="" />
    <a:font script="Jpan" typeface="ＭＳ Ｐゴシック"/>
    <a:font script="Hang" typeface="굴림"/>
    <a:font script="Hans" typeface="黑体"/>
    <a:font script="Hant" typeface="微軟正黑體"/>
    <a:font script="Arab" typeface="Arial"/>
    <a:font script="Hebr" typeface="Arial"/>
    <a:font script="Thai" typeface="Cordia New"/>
    <a:font script="Ethi" typeface="Nyala"/>
    <a:font script="Beng" typeface="Vrinda"/>
    <a:font script="Gujr" typeface="Shruti"/>
    <a:font script="Khmr" typeface="DaunPenh"/>
    <a:font script="Knda" typeface="Tunga"/>
    <a:font script="Guru" typeface="Raavi"/>
    <a:font script="Cans" typeface="Euphemia"/>
    <a:font script="Cher" typeface="Plantagenet Cherokee"/>
    <a:font script="Yiii" typeface="Microsoft Yi Baiti"/>
    <a:font script="Tibt" typeface="Microsoft Himalaya"/>
    <a:font script="Thaa" typeface="MV Boli"/>
    <a:font script="Deva" typeface="Mangal"/>
    <a:font script="Telu" typeface="Gautami"/>
    <a:font script="Taml" typeface="Latha"/>
    <a:font script="Syrc" typeface="Estrangelo Edessa"/>
    <a:font script="Orya" typeface="Kalinga"/>
    <a:font script="Mlym" typeface="Kartika"/>
    <a:font script="Laoo" typeface="DokChampa"/>
    <a:font script="Sinh" typeface="Iskoola Pota"/>
    <a:font script="Mong" typeface="Mongolian Baiti"/>
    <a:font script="Viet" typeface="Arial"/>
    <a:font script="Uigh" typeface="Microsoft Uighur"/>
    <a:font script="Geor" typeface="Sylfaen" />
  </a:minorFont>
</a:fontScheme>