Thank you for the help!
Hear is what i have come up with:
Creating A Vagabond
“Vagabond” is a template that can be added to any corporeal creature that has an Intelligence score (hereafter referred to as the “base creature”). It uses all the base creature’s statistics and special abilities except as noted here.
Hit Dice: Same as base creature, or the vagabonds (gained from class levels, is any), which ever is higher (also takes the higher of either hit points).
Speed: Same as base creature
AC: Same as base creature.
Attacks: Same as base creature. At creatures BAB, or vagabonds (from its class levels), which ever is higher
Damage: Same as base creature (although, such things as the monks unarmed damage, could be used).
Special Attacks: The vagabond retains all the special attacks of the base creature, plus it gains the following special attacks.
Psionics (Sp): The vagabond possesses psionics abilities equal to that of a psionic creature of equal HD (see PsiHB pg. 139). Vagabonds never have powers from the Psychokinesis discipline, however.
Psionic Attack/Defense Modes (Sp): A vagabond possesses all psionic attack and defense modes.
Special Qualities: The vagabond retains all of the special qualities of the base creature, plus it gains the following:
Reform (Su): the vagabond can create a body for - itself, should it not be inhabiting one, the body forms as the vagabond forms from what seems to be a blob of ink that quickly forms a three dimensions, into a creature or a verity of types. The vagabond can mimic any creature of a challenge rating of 3 + one half of the vagabonds charter level (if any).
Inhabit (Ex): the vagabond can merge with a dead or living creature, if given a chance. If it is a dead creature, the corpse is healed of any ailments, and the vagabond is in total control as the base creature is devoid of intelligence. if it becomes a part of a living host, it is only able to give strong suggestions, like a back-seat driver, it can not force the 'host' to take any actions it dose not wish to, but the vagabond can use any 'powers' it wishes to (as if it was a separate creature, as long as it can 'access' the 'components' for such powers).
Telepathy (Su): A vagabond can communicate telepathically with any creature within 100 ft that has a language.
Immunity (Ex): A vagabond is immune to all mind-affecting magical spells (not supernatural abilities or psionic powers).
Saves: Same as the base creature, or its own (from its own class levels) which ever is higher
Abilities: Same as the base creature except that, there is a separate Intelligence which is 18 (unless the base creature was created by the vagabond [as base creature IS the vagabond], or the vagabond inhabited a dead creature, in either case it replaces the base creatures intelligence), representing the vagabond. Base creatures Wisdom improves by +4 and Charisma increases by +2. Plus one half of the Vagabonds class level
Skills: Same as base creature, plus vagabonds (gained from class levels, if any)
Feats: as base creature, plus vagabonds (gained from class levels, is any)
Climate/Terrain: Same as base creature
Challenge Rating: Up to 3 HD, as base creature +2
4-7 HD, as base creature +3
8-15 HD, as base creature +4
16+ HD, as base creature +5
plus:up to 3rd vagabond class level, +2
4-7 vagabond class level, +3
8-15 vagabond class level, +4
16-20 vagabond class level, +5
adding an additional +1 for each additional 2 levels (half the vagabond class challenge rating mod. above, if said levels are NPC class levels)
Organization: Solitary or as part of base creature’s organization
Treasure: Same as base creature.
Alignment: Any (Neutral)
Advancement: base creature continues advancement as before except as noted below:
The vagabond and the base creature advances as separate creatures, earning XP, separately, (unless the base creature was created by the vagabond, or if the base creature was a corpse inhabited by the vagabond, in which case the base creature will not advance).
The vagabond needs one-thousand XP to advance to First level, from then on, it continues to advance as an ECL 1, creature.