The Mandombe script is not yet in Unicode. The script has a tentative allocation at U+15080..U+154FF in the  Roadmap to the SMP for the Unicode Standard.

A number of documents toward its inclusion have been submitted to the Unicode Technical Committee and WG2:

2009-04-22 Report to JTC1 Chair and JTC1/SC2 Chair Regarding Resolution 34 on African Languages — Deborah Anderson ( WG2 N3641,  L2/09-285)

2010-12-03 Proposal to add the Mandombe Script — David Wabeladio, Robert Wazi, Adrien Fwakasumbu ( L2/11-053)

2015-04-22 Preliminary proposal for encoding the Mandombe script in the SMP of the UCS — Andrij Rovenchak, Helma Pasch, Charles Riley, Nandefo Robert Wazi ( L2/15-118)

2015-10-01 Proposal for encoding the Mandombe script in the SMP of the UCS — Andrij Rovenchak, Helma Pasch, Charles Riley, Nandefo Robert Wazi ( L2/15-297)

2015-11-03 Comments on L2/15-297 Proposal for encoding the Mandombe script in the SMP — Patrick Andries ( L2/15-310)

2016-01-15 Proposal for encoding the Mandombe script in the SMP — Andrij Rovenchak, Helma Pasch, Charles Riley, Nandefo Robert Wazi ( L2/16-019)

2016-02-26 Proposal for encoding the Mandombe script in the SMP of the UCS (2nd revision) — Andrij Rovenchak, Helma Pasch, Charles Riley, Nandefo Robert Wazi ( L2/16-077)

Recommendations to UTC #147 May 2016 on Script Proposals — Deborah Anderson, Ken Whistler, Roozbeh Pournader, Andrew Glass, Laurentiu Iancu ( L2/16-156) (See section 7 for recommendations)

UTC #147 Minutes ( L2/16-121) (See C.6 for decision and action items)

2016-07-12 Reply to UTC comments regarding the Mandombe encoding proposal raised in L2/16-156 — Andrij Rovenchak, Helma Pasch, Charles Riley, Nandefo Robert Wazi ( L2/16-195)

Recommendations to UTC #148 August 2016 on Script Proposals — Deborah Anderson, Ken Whistler, Rick McGowan, Roozbeh Pournader, Andrew Glass, Laurentiu Iancu, and Lisa Moore ( L2/16-216) (See section 4 for recommendations)

UTC #148 Minutes ( L2/16-203) (See C.2.1 for decision and action items)