I'm currently playing two PCs in a 4.0 house ruled group (although some players IMG would say that one of these PCs is only a class feature

).
The main character is a hathran (Clr 4 / Sor 3 / Hth 6), following the table in the FRCS. The hathran update (in the PGtF) was out too late, so the group decided to move on with the 3.0 version. Her bodyguard is a Bbn 3 / Ftr 8 specialized in fighting with a spiked chain and almost maxed out ranks in listen and spot.
The hathran is the party's only cleric (CL 10) and often takes the role as a speaker, healer and rarely as a scout (she took the illusion and spell domains and
invisibility as her 2nd level sorceress spell). Most time in a session I'm playing the hathran.
The bodyguard is a quite silent man (Cha 9), happy to work as a protector of a hathran and the possibilities to increase his combat abilities. As a front-line fighter, he dislikes the party's archer because he almost only uses a bow and tries to stay in the second line. Otherwise, he follows the orders of the hathran, even if he has to stay behind when she is on a scouting mission or visiting a temple or the like (however, as a bodyguard, he dislikes such trips).
It is quite funny to play two characters and so far it seems to be ok. Although it quickly became clear that the Bbn/Ftr may take a very important role as a front-line character (high hp, and the attacks with a spiked chain proved to be very nasty for the foes...). But the group also learned it the hard way, that the bodyguard rarely would leave the hathran to help other party members. In fact, he never did so.
The three other warrior types in the party are a monk, a fighter/rogue/tempest and a ranger (with the archery combat style, so effectively a guy for the second line).