engine version...?
if something like 0.3+
you can trying edit it in protocolgame.cpp
find it:
C++:
void ProtocolGame::AddCreature(NetworkMessage_ptr msg, const Creature* creature, bool known, uint32_t remove)
below:
C++:
if(!known)
{
msg->AddU16(0x61);
msg->AddU32(remove);
msg->AddU32(creature->getID());
try with something like this:
C++:
std::string nickname= creature->getName();
if (const Player* target = creature->getPlayer())
nickname = "Level " + target->getLevel() + nickname;
over "}" from condition if(!known) add:
C++:
msg->AddString(creature->getHideName() ? "" : nickname);