A Research Study of How Safe a New Medicine Called NNC0519 0130 is and to Test Its Effect in People Living With Excess Body Weight With or Without Type 2 Diabetes

Inclusion Criteria: * Informed consent obtained before any study-related activities. Study-related activities are any procedures that are carried out as part of the study, including activities to determine suitability for the study. * Male or female of non-childbearing potential. * Age 18-55 years (both inclusive) at the time of signing the informed consent. * Considered eligible based on the medical history, physical examination, and the results of vital signs, electrocardiogram and clinical laboratory tests performed during the screening visit, as judged by the investigator. Participants with obesity only: * Body mass index between 30.0 kilogram per meter square (kg/m\^2) and 39.9 kg/m\^2 (both inclusive) at screening. Overweight should be due to excess adipose tissue, as judged by the investigator. Participants with type 2 diabetes with either overweight or obesity: * Body mass index between 27.0 kg/m\^2 and 39.9kg/m\^2 (both inclusive) at screening. Overweight should be due to excess adipose tissue, as judged by the investigator. * Diagnosed with type 2 diabetes mellitus greater than or equal to (≥) 180 days before screening. * Glycated haemoglobin (HbA1c) in the range of 6.5 percentage (%) (inclusive) and 9.5% (inclusive). Exclusion Criteria: * Any condition, except T2D and hypertension, which in the investigator's opinion might jeopardise participant's safety or compliance with the protocol. * Presence or history of any clinically relevant respiratory, metabolic,…