black_hair blue_eyes brown_hair chell digital_media_(artwork) duo feet female female_human gesture gordon_freeman grandfathered_content gravity_gun green_eyes hair half-life high_five human human_only humor light_body light_skin male mammal not_furry portal portal_(series) portal_gun science simple_background star tan_hair toes unknown_artist valve valve_corporation white_background zero-point_energy_field_manipulator
2010 anthro aquatic armor biped cetacean clothed clothing digitigrade dolphin gravity_gun gun half-life hazmat_suit hev_suit male mammal oceanic_dolphin pose ranged_weapon rukis signature simple_background solo standing tail tail_between_legs toothed_whale valve valve_corporation weapon zero-point_energy_field_manipulator
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