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You can do that: @startuml participant Bob as "<color:#red>Bob" Bob -> Alice : <color:#00FF00>hello @enduml Is it what you are looking for ?
Hello all,
To answer to an old question, you can also use:
@startuml skinparam participantFontColor automatic participant "Name of P1" as S1 #purple participant "Name of P2" as S2 #yellow @enduml
Regards.