as of current continuity there have been three different versions of the character which bear the name topo. the first version is an intelligent octopus who is usually seen babysitting aquababy to the best of his ability in the pre-"crisis" continuity. there is a second topo who becomes an ally to the second aquaman. he is an anthropomorphic squid-boy from dyss, who helps aquaman open portals throughout the ocean. all versions of the character has assisted aquaman in his adventures and also appeared assisting other heroes as well.