Well I can say that still now some of the Nintendo Characters are still unknown even for the most hardcore Nintendo fans, namely Kalas (Baten Kaitos), Colonel Scott O'Connor (Kabuki Quantum Fighter), Kabin (Battle Monster Tactics), Oni (Power Soukuban), Muguru-Kun (Power Lode Runner), John Solver (Bombsweeper), Pockle (GiFTPiA), Tin Star (Tin Star), Harry (Teleroboxer) and Mr. Stevenson (Gumshoe), those are some of the most obscure character you find from Nintendo History, well without counting Chavo from Bound High!, Dorin from Dragon Hopper and M-09 from Project H.A.M.M.E.R. that never release even after getting a playable demo or a full game.
.n_n.
To be fair, a lot of those games despite having publishing agreements aren't even owned by Nintendo.